Showing papers by "Masatake Haruta published in 1996"
TL;DR: Au/α-Fe2O3 and Au/Co3O4 catalysts with a nominal 10 atom % Au are active for CO oxidation even at temperatures below 0 °C as discussed by the authors.
Abstract: Au/α-Fe2O3 and Au/Co3O4 catalysts prepared by coprecipitation with a nominal 10 atom % Au are active for CO oxidation even at temperatures below 0 °C. The surfaces of these as-prepared, powdered ca...
184 citations
TL;DR: In this article, the effect of gold catalysts on CO removal from hydrogen was investigated in polymer electrolyte fuel cells using the reformed gas of methanol, showing that gold supported on manganese oxide is especially effective in the selective removal of hydrogen from hydrogen.
169 citations
TL;DR: Gold deposited on various oxides with high dispersion was found to be active for the hydrogenation of CO 2 at temperatures between 150 and 400°C and smaller gold particles gave higher methanol productivity per exposed surface area of gold as mentioned in this paper.
153 citations
TL;DR: In this paper, the formation of formaldehyde on silica can be appreciably enhanced by the impregnation of Fe, as far as iron loadings are kept below 0.1 atom.
67 citations
TL;DR: In this article, the authors show that Co3O4 films prepared by pyrolysis of an organometallic precursor show a humidity-sensitive absorbance change in the visible wavelength region at room temperature.
Abstract: Cobalt oxide (Co3O4) films prepared by pyrolysis of an organometallic precursor show a humidity-sensitive absorbance change in the visible wavelength region at room temperature. The light absorbance change is strongest at wavelengths around 350–400 nm. The reversible absorbance change and the relatively fast response time (within a few minutes) make the Co3O4 film a potential candidate for optical humidity detection.
66 citations
TL;DR: Using a Debye function analysis, the presence of icosahedral and face centered cuboctahedral gold in a 1 ∵ 1 ratio has been found in freshly prepared Au/Mg(OH)2 catalyst as discussed by the authors.
Abstract: Using a Debye function analysis, the presence of icosahedral and face centered cuboctahedral gold in a 1 ∶ 1 ratio has been found in freshly prepared Au/Mg(OH)2 catalyst. The results support earlier studies which suggest the icosahedral form to be more stable at small nanometer sizes. Interactions between the gold and the Mg(OH)2 support appear to be weak, with the gold rapidly coagulating over a period of three months. Re-analysis of the aged sample shows the gold to be mainly in the form of truncated decahedra.
50 citations
TL;DR: Gold-nickel oxide (AuNiO) composite films were prepared by sputterdeposition of fine Au particles on a glass plate substrate followed by pyrolysis of spin-coated nickel 2-ethylhexanoate as mentioned in this paper.
Abstract: Gold-nickel oxide (AuNiO) composite films were prepared by sputter-deposition of fine Au particles on a glass plate substrate followed by pyrolysis of spin-coated nickel 2-ethylhexanoate. They showed reversible changes in visible-near IR light absorption due to CO in air. The pretreatment of the AuNiO composite films with NO2 appreciably enhanced the CO-sensitive absorbance change, allowing optical CO detection over a wide concentration range of 50-10 000 ppm.
28 citations
Patent•
05 Nov 1996TL;DR: In this paper, a material having ultrafine gold particles immobilized thereon consists essentially of at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances.
Abstract: A material having ultrafine gold particles immobilized thereon consists essentially of at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances and ultrafine gold particles having a maximum particle diameter of 250 angstroms and deposited on the support with strong interaction. The material exhibits high activity as a catalyst for the oxidation of carbon monoxide to carbon dioxide. It is produced by causing a vaporized organic gold complex to contact at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances in an atmosphere of reduced pressure thereby inducing adsorption of the vapor of organic gold complex on the support and then heating the product of the adsorption to a temperature in the range of 100°-700° C.
23 citations
TL;DR: In this paper, a high activity for the partial oxidation of methane into CO and H2 with the selectivity of above 80% at 600 °C was reported. But this was at the expense of high temperature.
Abstract: Ir(5 wt%) supported on TiO2 afforded a high activity for the partial oxidation of methane into CO and H2 with the selectivity of above 80% at 600 °C.
9 citations
8 citations
Patent•
05 Nov 1996TL;DR: In this article, a material having ultrafine gold particles immobilized thereon consists essentially of at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances and ultra fine gold particles having a maximum particle diameter of 250 angstroms and deposited on the support with strong interaction.
Abstract: of EP0773062A material having ultrafine gold particles immobilized thereon consists essentially of at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances and ultrafine gold particles having a maximum particle diameter of 250 angstroms and deposited on the support with strong interaction. The material exhibits high activity as a catalyst for the oxidation of carbon monoxide to carbon dioxide. It is produced by causing a vaporized organic gold complex to contact at least one support selected from the group consisting of metal oxides, metal sulfides, and carbonaceous substances in an atmosphere of reduced pressure thereby inducing adsorption of the vapor of organic gold complex on the support and then heating the product of the adsorption to a temperature in the range of 100 - 700 DEG C.