Language：English   Publishing type：Research paper (scientific journal)   Publisher：CHEMICAL SOC JAPAN  

A Zn-Sn precursor with cubic-shaped particles was successfully prepared by a simple coprecipitation method to obtain Zn-Sn mixed oxide (ZTO) catalysts. The resulting ZTO catalyst maintained the cubic shape even after calcination at 900 degrees C. The catalytic activity for the cyanosilylation of benzaldehyde with trimethylsilyl cyanide increased with increasing calcination temperature, and reached the maximum value at 600 degrees C. The ZTO catalyst calcined at 600 degrees C exhibited higher catalytic activity than the other solid acid catalysts, SiO2-Al2O3 and Amberlyst 15 DRY.

DOI： 10.1246/cl.160320

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：石油学会 ; 1978-  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MYU, SCIENTIFIC PUBLISHING DIVISION  

Temperature-programmed reduction measurement combined with resistance measurement (TPR&R) was performed to investigate the reduction behavior of the samples containing the semiconductor materials, SnO2 and CuO/SnO2. The four reduction peaks were observed in the H-2-TPR profile of SnO2, being assigned to the reductions of surface adsorbed oxygen species, surface lattice oxygen, amorphous SnO2 and bulk SnO2. On the other hand, the H-2-TPR profile of CuO/SnO2 was more complicated than that of SnO2. The TPR&R measurement enabled definite assignments of the six reduction peaks of CuO/SnO2: the reductions of (I) Cu2+ to Cu+ in highly dispersed copper oxide, (II) bulk CuO to Cu, (III) Cu+ to Cu in highly dispersed copper oxide, (IV) SnO2 lattice oxygen interacting with highly dispersed copper oxide, (V) amorphous SnO2, and (VI) bulk SnO2.

DOI： 10.18494/SAM.2016.1281

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The perovskite-type oxide catalyst, SmFeO3, prepared by decomposition method of heteronuclear cyano complex precursor (CN method) was applied to liquid-phase organic reaction, cyanosilylation of benzaldehyde with TMSCN. The maximum catalytic activity per catalyst weight was achieved at 800 A degrees C of calcination temperature in CN method and it was found that the catalytic activity was strongly related to the crystallinity of SmFeO3 catalyst. The catalytic reaction performed in the presence of pyridine and 2,6-di-tert-butylpyridine suggests that the catalytically active sites are the Bronsted acid sites formed on the SmFeO3 catalyst. The catalytic activity of SmFeO3 catalyst prepared by CN method was much higher than those of acid catalysts: SiO2-Al2O3 and Amberlyst.

DOI： 10.1007/s11164-015-1980-y

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

Influence of coexisting Al2O3 on the catalytic activity for low-temperature water-gas-shift (LT-WGS) reaction over Cu catalyst was investigated. The catalytic activity of Cu/Al2O3 catalyst increased with decreasing mesopore size when S/C ratio was 2.2, whereas the catalytic activity with S/C ratio = 4.6 increased with increasing mesopore size. IR measurement combined with kinetic study suggested that the low catalytic activity of Cu/CeO2 catalyst comes from the restriction of CO adsorption on Cu-0 by bidentate-type carbonate formed on the strong basic site of CeO2 support. On the other hand, it was found that bidentate-type carbonate was not formed on Cu/Al2O3 showing high catalytic activity for LT-WGS reaction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.ijhydene.2014.07.021

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The carbon oxidation over copper ion-exchanged zeolites (Cu-MFI, Cu-MOR, Cu-FAU, and Cu-BEA) pretreated at 700 A degrees C was investigated. The catalytic activities of Cu-MFI, Cu-MOR, and Cu-FAU pretreated at 700 A degrees C were higher for carbon oxidation in NO + O(2) atmosphere than that of Cu-BEA. The TEM results demonstrated that Cu fine particles were formed on the external surface of Cu-MFI, Cu-MOR, and Cu-FAU, showing high activity. In addition, it was suggested that the coexisting NO plays an important role in enhancing the catalytic activity of Cu-MFI for carbon oxidation.

DOI： 10.1007/s11164-011-0381-0

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

The CO sensing property of CuO-loaded SnO2-In2O3 sensor was investigated in a reducing atmosphere. The sensor response to CO for CuO/SnO2-In2O3 (8/2) was much higher than that for CuO/SnO2 in the range of 200-1000 ppm of CO concentration. Such a high sensor response of CuO/SnO2-In2O3 may originate from the high dispersion of CuO playing a role as sensing site. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.snb.2010.10.044

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The electrochemical performances of proton-conducting SOFCs with the perovskite-type oxide cathodes were investigated at low temperature of 773 K. Among the perovskite-type oxides used in the present study. La(0.7)Sr(0.3)FeO(3) (LSF) cathode exhibited the lowest overpotential at 773 K. The power density of the SOFC was dependent on the particle size of LSF cathode. The decrease in the particle size resulted in the decrease in over potential. The Power density of the cell with LSF cathode was also dependent on the thickness of LSF cathode; in the present condition, the LSF cathode with 13-mu m thickness showed the best electrochemical performance at 773 K. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2010.08.002

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Language：Japanese   Publisher：化学センサ研究会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

The photocatalytic reaction in the partial oxidation of alpha-methylstyrene (alpha-MS) to acetophenone (AP) was investigated for TiO(2) supported on H-ZSM-5 (H-MFI), H-mordenite (H-MOR), and H-Y-type (H-FAU) zeolites. XRD results demonstrated that the anatase was the stable phase of TiO(2) supported on zeolites. Photocatalytic activities of supported catalysts decreased in the following order: TiO(2)/H-MFI "TiO(2)/H-MOR > (TiO(2)) > TiO(2)/H-FAU" (blank). TiO(2)/H-MFI catalyst exhibited the best performance for photocatalytic oxidation of alpha-MS to AP. The maximal activity was obtained by 25 wt% TiO(2)/H-ZSM-5. The addition of water to the reaction solvent resulted in significantly lowering the photocatalytic activity for TiO(2)/H-ZSM-5 catalyst, although its activity for TiO(2) and TiO(2) + H-ZSM-5 mechanical mixture was little influenced by the amount of water added to reaction solvent. (C) 2009 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.electacta.2009.11.091

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Pt catalysts supported on Al(2)O(3) beads prepared by a sputter deposition method showed the higher surface concentration of Pt than impregnated Pt catalysts. The catalytic activities of the oxidation of acetylene carbon black over the sputtered Pt catalysts were higher than those over the impregnated Pt catalysts with the same Pt content.

DOI： 10.1007/s11244-010-9500-1

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The carbon oxidation was investigated over copper ion-exchanged MR zeolite (Cu-MFI) as a function of pretreatment temperature. Cu-MR pretreated at 700 degrees C exhibited high activity for carbon oxidation in NO + O(2) atmosphere. The activity of Cu-MFI pretreated at 700 degrees C increased with increasing the amount of copper ion exchanged. XRD and ESR measurements suggest that the CuO fine particles as an active site for carbon oxidation were formed on the surface of MR zeolite by pretreatment at 700 degrees C. (C) 2010 Elsevier By. All rights reserved.

DOI： 10.1016/j.catcom.2010.02.025

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

Phase separation in an acidic aqueous solution with sodium silicate and sodium dodecyl sulfate (SDS) was investigated. The solution separated into silica-rich and SDS-rich phases during condensation of silica components. During the phase separation, the transition structure was fixed by gelation, resulting in mutually continuous morphology. The addition of a small amount of water-miscible organic solvents, such as methanol, ethanol, 1-propanol, and 1-butanol, into the reacting solution greatly decreases both viscosity and phase separation tendency of the solution. In the system with high concentration of strong acid. SDS molecules form wormlike micelles, which not only increase viscosity of the solution hut also play an important role in the phase separation in the solution because the to of wormlike micelles increases apparent molecular weight of SDS and decreases mixing entropy. The decrease in the viscosity by the addition of organic solvents suggests that wormlike in become small in the presence of organic solvent molecules. Consequently, the addition of appropriate amount of organic solvent is effective for controlling phase separation tendency and size of the resulted macropores in the system with SDS through the change in the structure of the micelles. (C) 2010 The Ceramic Society of Japan All rights reserved

DOI： 10.2109/jcersj2.118.295

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS INC  

CO sensing properties of various transition metal oxide-loaded SnO2 sensors were investigated in a reducing atmosphere such as wet H2 gas. Among transition metal oxide-loaded SnO2 sensors used in the present study, CuO-loaded SnO2 sensor exhibited the highest sensor response to 1% CO in wet 50% H2 at around 150 degrees C, while it showed no sensor response in dry 50% H2. From X-ray diffraction (XRD) analysis, CuO was reduced to metallic Cu in a reducing atmosphere at above 150 degrees C. H2-temperature-programmed reduction (H2-TPR) and diffuse reflectance Fourier transform infrared (DRIFT-IR) spectroscopy measurements were carried out to discuss the sensor response mechanism.

DOI： 10.1080/10426911003750745

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The perovskite-type SmFe (x) Co1-x O-3 oxides were prepared by the thermal decomposition of heteronuclear cyano complexes, Sm[Fe (x) Co1-x (CN)(6)] a (TM) nH(2)O. XRD studies demonstrated that SmFe (x) Co1-x O-3 catalyst prepared by the thermal decomposition of heteronuclear cyano complex at 1,273 K showed orthorhombic structure in whole range of x. The catalytic activity for CO oxidation was dependent on x in SmFe (x) Co1-x O-3; the maximum activity was obtained for SmFe0.5Co0.5O3.

DOI： 10.1007/s11244-009-9233-1

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Language：English   Publisher：ELECTROCHEMICAL SOC JAPAN  

The electrochemical performances of Proton-conducting SOFC with La0.7Sr0.3FeO3 (LSF) cathode fabricated by the electrophoretic deposition (EPD) technique were investigated. The EPD technique provided the uniform layer of LSF cathode with constant thickness and can easily control the thickness by changing all applied voltage. The power density of the SOFC cell was dependent on the thickness of LSF cathode. The activation energy was measured to elucidate the rate-determining, step for LSF cathode reaction.

DOI： 10.5796/electrochemistry.77.143

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The catalytic activities of the low-temperature water-gas-shift (LT-WGS) reaction were investigated for Al2O3-supported Cu catalysts containing CrOx, MnOx, FeOx, CoOx, NiOx, or ZnO. The catalytic activity of Cu/Al2O3 catalyst at 423 K was improved by the small addition of transition-metal oxide. fit particular, Cu/Al2O3 with CoOx showed the highest activity among the supported Cu catalysts used in this study.

DOI： 10.1246/cl.2009.172

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC JAPAN  

The electrochemical performances of Proton-conducting SOFC with La0.7Sr0.3FeO3 (LSF) cathode fabricated by the electrophoretic deposition (EPD) technique were investigated. The EPD technique provided the uniform layer of LSF cathode with constant thickness and can easily control the thickness by changing all applied voltage. The power density of the SOFC cell was dependent on the thickness of LSF cathode. The activation energy was measured to elucidate the rate-determining, step for LSF cathode reaction.

DOI： 10.5796/electrochemistry.77.143

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2009F.0.2Q01.0

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Among the supported Cu-FeO(x) catalysts, Al(2)O(3)-supported Cu-FeO(x) catalyst exhibited the highest activity for WGS reaction. The enhancement of the catalytic activity by adding FeO(x) to Cu/Al(2)O(3) could be interpreted by the two possibilities; one is the formation of highly dispersed Cu(0) and the other is the participation of reduced FeO(x) in WGS reaction in the presence of Cu(0).

DOI： 10.1007/s10562-008-9504-7

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP  

The catalytic activities of the low-temperature water-gas-shift (WGS) reaction were investigated for Al(2)O(3)-supported Cu catalysts containing CrO(x), MnO(x), FeO(x), CoO(x)., or NiO(x). The catalytic activity of Cu/Al(2)O(3) catalyst at 423 K was enhanced by the addition of transition metal oxide. FeO(x) and MnO(x) additives additionally gave the enhancement in the catalytic activity at 523 K. The preparation conditions concerning calcination temperature and MOx/Cu molar ratio were optimized for Cu-FeO(x)/Al(2)O(3) and Cu-CoOx/Al(2)O(3) catalysts. The reason why the catalytic activity was enhanced by adding Fe Ox and CoO(x) to Cu/Al(2)O(3) was proposed on the basis of XRD and H(2)-TPR results.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP  

The electrochemical performances of the perovskite-type oxide cathode with uniform particles were investigated in H(2)-O(2) SOFC system using proton conductor. Among the perovskite-type oxides used in the present study, La(0.7)Sr(0.3)FeO(3) (LSF) exhibited the lowest cathodic overpotential at the temperature as low as 773 K. It was found that the overpotentials of LSF cathode and the activation energies of cathode reaction were influenced by the electrode morphologies such as particle size and uniformity. The electrophoretic deposition (EPD) as a new method was applied to fabricate the LSF cathode on electrolyte surface.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

CO sensing properties of various transition metal oxide-loaded SnO2 sensors were investigated in a reducing atmosphere such as wet H-2 gas. Among transition metal oxide-loaded SnO2 sensors used in the present study, 5wt%CuO-loaded SnO2 sensor exhibited the highest sensitivity to 1% CO in wet 50% H-2 at around 150 degrees C, while it showed no sensitivity in dry 50% H-2. From XRD analysis, CuO was reduced to metallic Cu in a reducing atmosphere at above 150 degrees C. H2-temperature-programmed reduction (H-2-TPR) and diffuse reflectance fourier transform infrared (DRIFT-IR) spectroscopy measurements were carried out to discuss the sensor response mechanism.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TRANS TECH PUBLICATIONS LTD  

CO sensing properties of various transition metal oxide-loaded SnO2 sensors were investigated in a reducing atmosphere such as wet H-2 gas. Among transition metal oxide-loaded SnO2 sensors used in the present study, 5wt%CuO-loaded SnO2 sensor exhibited the highest sensitivity to 1% CO in wet 50% H-2 at around 150 degrees C, while it showed no sensitivity in dry 50% H-2. From XRD analysis, CuO was reduced to metallic Cu in a reducing atmosphere at above 150 degrees C. H2-temperature-programmed reduction (H-2-TPR) and diffuse reflectance fourier transform infrared (DRIFT-IR) spectroscopy measurements were carried out to discuss the sensor response mechanism.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

This paper presents a study on the influence of support (Al2O3, MgO, SiO2-Al2O3, SiO2-MgO, beta-zeolite, and CeO2) of Cu-ZnO catalysts for the low-temperature water-gas shift reaction. Supported Cu-ZnO catalysts were prepared by the conventional impregnation method, followed by the H-2 reduction. The activity of Cu-ZnO catalysts for the water-gas shift (WGS) reaction was largely influenced by the kind of support; Cu-ZnO catalysts supported on Al2O3, MgO, and CeO2 showed high activity, while those on SiO2-Al2O3, SiO2-MgO and beta-zeolite showed less activity in the temperature range 423-523 K. XRD analysis demonstrated that the copper species were highly dispersed on the supports used in the present study, except for a MgO support. TPR results of a series of supported CuO-ZnO catalysts suggest that the reducibility of CuO is one of the important factors controlling the activity of the WGS reaction over the supported catalysts. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cattod.2007.06.020

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The decomposition activities of nitrogen monoxide (NO) were investigated for the copper ion-exchanged ZSM-5 zeolites (Cu-MFI) containing the rare-earth elements: La, Ce, Pr, Nd, Sm, and Gd. It was found that Sm and Gd acted as promoter for NO decomposition over Cu-MFI with 60-70% of the exchange level of copper ion, while the addition of the other rare-earth elements to Cu-MFI showed no positive effect on NO decomposition activity. The introduction of Sm and Gd to Cu-MFI had little influence on the effectiveness of each copper ion for NO adsorption in the MFI zeolite. The presence of Sm and Gd stabilized Cu+ as an active center. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cattod.2007.06.003

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This paper presents a study on the influence of support (Al2O3, MgO, SiO2-Al2O3, SiO2-MgO, beta-zeolite, and CeO2) of Cu-ZnO catalysts for the low-temperature water-gas shift reaction. Supported Cu-ZnO catalysts were prepared by the conventional impregnation method, followed by the H-2 reduction. The activity of Cu-ZnO catalysts for the water-gas shift (WGS) reaction was largely influenced by the kind of support; Cu-ZnO catalysts supported on Al2O3, MgO, and CeO2 showed high activity, while those on SiO2-Al2O3, SiO2-MgO and beta-zeolite showed less activity in the temperature range 423-523 K. XRD analysis demonstrated that the copper species were highly dispersed on the supports used in the present study, except for a MgO support. TPR results of a series of supported CuO-ZnO catalysts suggest that the reducibility of CuO is one of the important factors controlling the activity of the WGS reaction over the supported catalysts. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cattod.2007.06.020

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The photocatalytic reaction in the partial oxidation of a-methylstyrene (alpha-MS) to acetophenone (AP) was investigated for TiO2 supported on Y-type, moredenite, and ZSM-5 zeolites. XRD and FT-Raman results demonstrated that the anatase is the stable phase of TiO2 supported on zeolites and no rutile phase was observed in the supported catalysts calcined at 723-973 K. TiO2 supported on zeolites was found to catalyze the partial oxidation of a-MS to AP under light irradiation (> 290 nm). The photocatalytic activity of TiO2 supported on zeolites was significantly improved by the addition of the water to the organic solvent. It was found that the optimized amount of water added for TiO2 supported on zeolite catalysts was smaller than that for TiO2 catalyst. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cattod.2006.07.039

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELECTROCHEMICAL SOC INC  

Metal wire meshes were coated with electrode materials such as La0.8Sr0.2NbO3 and NiO/YSZ by electrophoretic deposition (EPD) and used as current collectors for a solid oxide fuel cell. The current interrupt analysis for the electrodes attached with the wire mesh current collectors clearly indicated that coated wire meshes remarkably reduced the cathodic and anodic resistances, especially polarization component, compared to using the uncoated meshes. This reduction of the electrode resistances is due to the fact that EPD coating of the metal meshes increases effective contact area and/or points between the wire mesh and electrode surface. A single cell with the EPD coated meshes exhibited higher I-V characteristics compared to that with the uncoated meshes as expected from the result of the electrode resistance measurements.

DOI： 10.1149/1.2729235

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCI LTD  

The electrochemical performances were investigated for proton-conducting solid oxide fuel cells (SOFCs) with the perovskite-type oxide cathodes. As for proton-conducting SOFC using BaCe0.8Y0.2O3 (BCYO) and SrCe0.95Yb0.05O3 (SCYO) electrolytes, La0.7Sr0.3O3 (LSFO) cathode showed the best electrochemical performance among the perovskite-type oxides tested in the present study. The spin-coating technique was applied to fabricate BCYO thin film on the LSFO substrate. With this technique, dense and crack-free BCYO thin film could be fabricated on LSFO electrode substrate. However. the electrical conductivity of BCYO thin film fabricated on LSFO electrode substrate was lower than that of the bulk BCYO specimen. suggesting the formation of the second phase between the electrolyte film and the oxide substrate. (c) 2007 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jeurceramsoc.2007.02.116

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：MATERIALS RESEARCH SOC  

The cathode performances of perovskite-type oxide electrodes were investigated in the H-2-O-2 fuel cell with proton-conducting electrolyte. Among the perovskite-type oxides tested in the present study, La1-xSrxFeO3 (LSFO) showed the best cathode performance. The cathode performances of LSFO depended on the Sr content and the heat-treatment temperature prior to electrochemical measurements. The cathode reactions of both LSFO and Pt electrodes are discussed briefly based on the cathode overpotentials measured as a function of oxygen partial pressure. Finally, the structure and the electrical conductivity of the proton-conducting ceramic film fabricated on LSFO electrode substrate are presented.

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The anode performances of Ni/(CeO2)(1-x)(LnO(1.5))(x) (Ln: La, Pr, Nd, Sm, Gd, and Yb) were investigated in direct-methane solid oxide fuel cells. Among the anodes tested in the present study, Ni/CeO2-Sm2O3 and Ni/CeO2-Yb2O3 composite anodes showed relatively low anodic overpotential. The anodic overpotential of Ni(x wt%)/(CeO2)(1-y)(SmO1.5)(y) depended strongly on Ni content, while it less depended on Sm content. The catalytic activity of methane oxidation was measured for Ni/LnDC at 973 K and Ni/CeO2 and Ni/CeO2-Yb2O3 samples showed high catalytic activity. This result suggests that the activity for the direct oxidation of methane by O-2 is not the main factor controlling the anodic overpotential in direct-methane solid oxide fuel cell.

DOI： 10.1149/1.2729281

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELECTROCHEMICAL SOC INC  

The anode performances of Ni/(CeO2)(1-x)(LnO(1.5))(x) (Ln: La, Pr, Nd, Sm, Gd, and Yb) were investigated in direct-methane solid oxide fuel cells. Among the anodes tested in the present study, Ni/CeO2-Sm2O3 and Ni/CeO2-Yb2O3 composite anodes showed relatively low anodic overpotential. The anodic overpotential of Ni(x wt%)/(CeO2)(1-y)(SmO1.5)(y) depended strongly on Ni content, while it less depended on Sm content. The catalytic activity of methane oxidation was measured for Ni/LnDC at 973 K and Ni/CeO2 and Ni/CeO2-Yb2O3 samples showed high catalytic activity. This result suggests that the activity for the direct oxidation of methane by O-2 is not the main factor controlling the anodic overpotential in direct-methane solid oxide fuel cell.

DOI： 10.1149/1.2729281

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The effect of calcination temperature on the catalytic activity for water-gas-shift (WGS) reaction was investigated for copper/alumina catalysts prepared by the impregnation method. The catalyst calcined at 1073 K, followed by the treatment in H-2 at 523 K, showed a high activity for WGS reaction. XRD and H-2-TPR measurements revealed that the catalyst calcined at 1073 K contained both highly dispersed CuO and spinel CuAl2O4 particles. The former species was reduced by the treatment in H? at 523 K to yield the highly dispersed metallic copper which would act as catalytically active sites in WGS reaction. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.catcom.2005.11.004

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Copper (11) phthalocyanine (CuPc) molecules encapsulated into zeolite-Y with Si/Al ratios of 2.7 and 410 were prepared by an in situ synthesis and characterized by UV-Vis and electron paramagnetic resonance (EPR) spectroscopies. Resolved Cu-hyperfine and N-superhyperfine structures were observed in the EPR spectrum of CuPc encapsulated into zeolite-Y with a high Si/Al ratio. UV-Vis and EPR studies as well as theoretical calculations suggest that the encapsulated CuPc molecule was distorted in zeolite-Y with keeping of the square-planar symmetry around the center copper (II) ion. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cplett.2005.08.140

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The cathodic polarization of strontium-doped lanthanum ferrite, La1-xSrxFeO3-alpha, was studied in the hydrogen-oxygen fuel cell using proton-conducting SrCe0.95Yb0.05O3-alpha as an electrolyte. The overpotential of La0.7Sr0.3FeO3-alpha cathode was smaller than those of other perovskite-type oxides such as La0.7Sr0.3MnO3-alpha and La0.7Sr0.3CoO3-alpha, and platinum at 773-973 K. The best cathodic performance was obtained for La0.7Sr0.3FeO3-alpha heat-treated at 1173 K. The cathode resistance of La0.7Sr0.3FeO3-alpha was independent of pO(2) while that of sputtered platinum was proportional to pO(2)(-1/4). (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.ssi.2004.08.008

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The sensitivity, as well as selectivity of an In2O3-based element to CO over H-2, was improved dramatically by the addition of 0.5 wt.% cobalt oxide and 0.04 wt.% Au. The doubly promoted element thus obtained gave excellent GO-sensing characteristics at 250 degrees C. It was suggested from the measurements of catalytic oxidation activities of the In2O3-based materials that the remarkable promotion of CO-sensing properties originated from the proper enhancement of CO oxidation activity. (C) 2000 Elsevier Science S.A. All rights reserved.

DOI： 10.1016/S0925-4005(99)00456-6

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Language：Japanese   Publisher：The Institute of Electrical Engineers of Japan  

Aiming at developing a semiconductor CO sensor applicable to the safety control of gas appliances, we carried out an extensive material search for promoters to In₂O₃-based elements. Among the elements added (0.5 wt%) with each of 12 transition metal oxides, the Co₃O₄-added one was outstanding in sensitivity and selectivity to CO at 200°C. Remarkably the sensing properties of this element could be improved further by the addition of Au (0.04 wt%). The doubly promoted element, Au (0.04 wt%)-Co(0.5 wt%)-In₂O₃, gave excellent characteristics in sensitivity to CO, selectivity to CO over H2 and other selected gases, and response rates at 250°C. The promoting effects of the additives were shown to originate from the proper enhancement of catalytic activity for CO oxidation.

DOI： 10.1541/ieejsmas.118.100

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：WORLD PUBLISHING CORPORATION  

The sensitivity as well as selectivity of an In2O3 element to CO over H-2 was improved dramatically by the addition of 0.5 wt% cobalt oxide. It's sensing properties could be increased further by the addition of 0.04 wt% Au. The doubly promoted element thus obtained, Au(0.04 wt%)-Co3O4(0.5 wt%)-In2O3, gave excellent characteristics in sensitivity to CO, selectivity to CO over H-2 and other selected gases, and response rate at 250 degrees C. It was suggested from the measurements of catalytic oxidation activities of the In2O3-based materials that the remarkable promoting effects of the additives on the CO sensing properties originated from the proper enhancement of CO oxidation activity.

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC INC  

Among the In2O3-based elements loaded with each of 12 metal oxides [0.5 weight percent (w/o) each], the Co2O4-added element was outstanding in sensitivity and selectiveness to CO at 250 degrees C. Remarkably the sensing properties of this element could be increased further by the addition of Au (0.04 w/o). The element thus obtained, Au (0.04 w/o)-Co (0.5 w/o)-In2O3, gave excellent characteristics in sensitivity to CO, selectivity to CO against H-2 and other selected gases, and responses rate at 250 degrees C, giving promise of being applied as a CO sensor for safety control of gas appliances.

DOI： 10.1149/1.1837710

Web of Science

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELECTROCHEMICAL SOCIETY INC  

For the purpose of developing a semiconductor type CO sensor applicable to safety control of gas appliances, an extensive search for sensing materials and promoters were carried out. Among various oxides tested, In2O3 exhibited the highest sensitivity to CO(1000 ppm in wet air) at 300 and 400 degrees C, followed by SnO2, ZnO and Fe2O3, though all these oxides were even more sensitive to Hz. When loaded with Rb2CO3 (5 wt%) or Co3O4 (0.5 wt%), the In2O3-based element was brought to be very sensitive and selective to CO at 300 or 250 degrees C, respectively, suggesting promise for an incomplete-combustion sensor. The promoting effects of the additives were shown to originate from the proper enhancement of CO oxidation activity.

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA LAUSANNE  

Among various single-metal oxides, In2O3, SnO2 and ZnO were found to exhibit rather high sensitivities to CO at 300 degrees C and above. Especially In2O3 appeared to be most attractive in view of the selectivity to CO over H-2. It was further found that modifications of In2O3 with the addition of alkali metal carbonates, especially Rb2CO3, were very effective for enhancing the sensitivity and the selectivity to CO. The sensor element using Rb-In2O3 could detect 500-4000 ppm CO in wet air at 300 degrees C satisfactorily, while its cross-sensitivities to other gases such as H-2, CH4, C3H6, and NO were comparatively small. Catalytic activity test and TPD measurements showed that, as a reason for the promoting effects, the addition of Rb2CO3 to In2O3 enhances the catalytic activity of CO oxidation. In addition, XPS data indicated that, as another reason, Rb2CO3 forms the strongest p-n junctions with In2O3 among alkali metal carbonates.

DOI： 10.1016/S0925-4005(97)80090-1

Web of Science

Scopus

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC INC  

From a screening test for the sensing properties of 26 single oxides, an In2O3 sensor element was found to exhibit rather high sensitivity to both CO and H-2 in wet air at 300 degrees C. In order to improve the selectivity to CO vs. H,, each of 33 metal oxides was added to In2O3. As a result, the addition of alkaline metal oxides was found to enhance markedly both sensitivity and selectivity to CO. Particularly, Rb2O (5 weight percent)-In2O3 element showed the highest CO selectivity. It could detect 500 to 4000 ppm CO in wet air at 300 degrees C satisfactorily.

DOI： 10.1149/1.1836449

Web of Science

Scopus

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publisher：Kyushu University  

A series of metal titanates was examined for their NOx sensing properties at elevated temperatures of 500-600℃. As a result, BaTiO3 and SrTiO3 sensors were found to be rather sensitive to NO and/or NO2 existing in air at 600 and 500℃, respectively, together with practically acceptable response and recovery rates. At these temperatures, both sensors exhibited almost linear sensitivity-NOx concentration correlations in the concentration range of 5-100ppm.The electrical resistance of SrTiO3 sensor at 500℃was almost independent of oxygen concentration in the range of 3-15％and scarcely affected by interfering gases such as CO2, H2, and C3H6. The NOx sensing mechanism of this element was briefly discussed.

DOI： 10.15017/17382

CiNii Books

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2019.0_4

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2019f.0_166

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J-GLOBAL

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Authorship：Lead author   Language：English   Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2018f.0_165

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Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2017f.0_125

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2017f.0_121

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2016f.0_90

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Language：Japanese   Publisher：The Japan Petroleum Institute  

The adsorption of Hg(II) from aqueous solution by activated carbon obtained from date palm  was studied. In the present study, ZnCl₂, CO₂, H₃PO₄, and KOH were used as an activated agent for activated carbon prepared from date palm. Among the activated carbons prepared by all the above activate agents, the activated carbon by ZnCl₂ exhibit the highest Hg uptake ability, followed by those by H₃PO₄ and KOH with a slight difference. The amount of Hg uptake for the activated carbon by CO₂, which is non-chemical activation, was lower than those by ZnCl₂, H₃PO₄ and KOH activated agents. It was clear that the amount of Hg uptake for the activated carbons prepared from date plam was 4-5 times larger than that for the commercial activated carbon, HG-S. In the present study, treatment time, concentration, adsorbent amount, and pH effects on the amount of Hg uptake were evaluated.

DOI： 10.11523/sekiyu.2015f.0_143

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2014f.0_97

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2013f.0_156

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2011f.0.168.0

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2009F.0.2I26.0

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2008f.0.72.0

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2008F.0.493.0

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2008F.0.717.0

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Language：Japanese   Publisher：The Ceramic Society of Japan  

DOI： 10.14853/pcersj.2008F.0.683.0

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2007f.0.4.0

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2007f.0.142.0

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Language：Japanese   Publisher：The Japan Petroleum Institute  

DOI： 10.11523/sekiyu.2006f.0.4.0

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Presentation type：Oral presentation (general)  

Venue：釜山(韓国)  

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Venue：広州(中国)  

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Venue：福岡  

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Ni系触媒は改質触媒として用いられているが、Ni粒子の凝集による失活が問題となっている。そこで本研究ではNi粒子の高分散化が期待できるスパッタリング法により、担持Ni触媒を調製し、その物性と水蒸気改質触媒活性について検討した。また、含浸法により調製した触媒の物性、触媒活性との比較を行った。

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Venue：ホノルル（アメリカ）  

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Venue：名古屋  

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Venue：大阪  

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The cathode performances of perovskite-type oxide electrodes were investigated in the H2-O2 fuel cell with proton-conducting electrolyte. Among the perovskite-type oxides tested in the present study, La1-xSrxFeO3 (LSFO) showed the best cathode performance. The cathode performances of LSFO depended on the Sr content and the heat-treatment temperature prior to electrochemical measurements. The cathode reactions of both LSFO and Pt electrodes are discussed briefly based on the cathode overpotentials measured as a function of oxygen partial pressure. Finally, the structure and the electrical conductivity of the proton-conducting ceramic film fabricated on LSFO electrode substrate are presented. © 2007 Materials Research Society.

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Language：Japanese  

油脂類のバイオディーゼル燃料への変換触媒技術として、アルカリ、あるいは酸を利用した均一触媒が主流である。本研究では、不均一触媒に着目し、アルカリ土類金属酸化物及び、その担持体の触媒活性及び活性劣化原因について検討した。

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水性ガスシフト反応におけるアルミナ担持Cu触媒への種々の遷移金属酸化物の添加効果について検討した。測定温度によって添加効果を示す金属酸化物が異なった。測定温度250℃ではFeO<SUB>x</SUB>を添加した触媒で顕著な添加効果が得られたのに対し、測定温度150℃ではCoO<SUB>x</SUB>を添加した触媒で顕著な添加効果が得られた。XRD、BET、H<SUB>2</SUB>-TPR、N<SUB>2</SUB>O-パルス測定を行い、遷移金属酸化物の添加による活性点である金属銅表面積への影響についても報告する。

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我々はこれまでに、固体酸化物形燃料電池（SOFC）の電極作製に電気泳動堆積（EPD）法を応用し、その有効性を報告してきた。本研究では、酸素イオン導電体を用いたSOFCのNi-YSZサーメットアノード作製にEPD法を適用し、電極と電解質との親和性やガスの拡散性の改善を試みた。 特に、Niの濃度勾配をつけたNi-YSZサーメットアノードが燃料電池性能を向上させることがわかった。

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