22 Result(s)

Article

Fabrication of Hydrophobic Zeolites Using Triethoxyfluorosilane and their Application for Photocatalytic Degradation of Acetaldehyde

Hydrophobically modified zeolites were prepared using alkoxide reagent containing fluorine, triethoxyfluorosilane (TEFS). These zeolites have still maintained mesoporous structure and large surface area and sh...

Yasutaka Kuwahara, Takashi Kamegawa, Kohsuke Mori… in Topics in Catalysis (2009)

Article

Methane Steam Reforming in Hydrogen-permeable Membrane Reactor for Pure Hydrogen Production

Steam reforming of methane over a ruthenium catalyst has been carried out at 500 °C in a membrane reactor equipped with a palladium membrane supported on a porous stainless steel tube. Hydrogen and carbon diox...

Yasuyuki Matsumura, Jianhua Tong in Topics in Catalysis (2008)

Article

Novel Pd/SiO₂ Membrane Supported on Porous Stainless Steel for High Temperature Hydrogen Separation

Thin Palladiun/SiO₂ composite membrane supported on porous stainless steel has been fabricated by a novel preparation procedure. SiO₂ colloid suspensions with different particle sizes were applied to modify the p...

Caili Su, Tetsuro **, Koji Kuraoka, Yasuyuki Matsumura… in MRS Online Proceedings Library (2003)

Article

Effect of H₂O on the partial photo-oxidation of ethylene over Cu/SiO₂ photocatalyst

Ethylene can be catalytically photo-oxidised with water as an oxidant over silica-supported copper oxide evacuated at 973 K. Presence of Cu⁺ cations in the catalyst is evidenced by X-ray Absorption Near-Edge Stru...

Yuichi Ichihashi, Yasuyuki Matsumura in Research on Chemical Intermediates (2003)

Article

Catalytic Methanol Decomposition Over Palladium Deposited on Mesoporous Cerium Oxide

Ultrafine palladium particles can be deposited on mesoporous cerium oxide by a deposition–precipitation method. After reduction with hydrogen at 300 °C, palladium on the mesoporous compound is cationic with a ...

Mahendra P. Kapoor, Yuichi Ichihashi, Koji Kuraoka, Wen-Jie Shen… in Catalysis Letters (2003)

Article

Methanol Decomposition and Synthesis Over Palladium Catalysts

Palladium is generally active in the catalytic decomposition and synthesis of methanol. The activity of palladium is largely affected by its support. Cerium oxide is an effective support especially when the ca...

Yasuyuki Matsumura, Wen-Jie Shen in Topics in Catalysis (2003)

Article

Hydrogen production using semiconducting oxide photocatalysts

Sang-Chul Moon, Yasuyuki Matsumura, Masaaki Kitano… in Research on Chemical Intermediates (2003)

Article

Methanol Synthesis from Carbon Monoxide and Hydrogen over Ceria-Supported Copper Catalyst Prepared by a Coprecipitation Method

High catalytic activity in the synthesis of methanol from carbon monoxide and hydrogen can be produced with ceria-supported copper catalysts prepared by a coprecipitation method. The activity at 468 K is compa...

Wen-Jie Shen, Yuichi Ichihashi, Yasuyuki Matsumura in Catalysis Letters (2002)

Article

A Comparative Study of Palladium and Copper Catalysts in Methanol Synthesis

Catalytic activity of copper supported on cerium oxide (Cu/CeO₂) in methanol synthesis from carbon monoxide and hydrogen at 473 K is similar to that of ceria-supported palladium (Pd/CeO₂). Both catalysts contain ...

Wen-Jie Shen, Yuichi Ichihashi, Yasuyuki Matsumura in Catalysis Letters (2002)

Article

Catalytic Activity of Palladium Supported on Mesoporous Zirconium Oxide in Low-Temperature Methanol Decomposition

Methanol decomposition to hydrogen and carbon monoxide can be effectively catalyzed at 160–220°C over palladium supported on mesoporous zirconium oxide by the deposition–precipitation method. The electronic st...

Mahendra P. Kapoor, Yuichi Ichihashi, Wen-Jie Shen, Yasuyuki Matsumura in Catalysis Letters (2001)

Article

Growth of Pd particles in methanol synthesis over Pd/CeO2

The metal–support contact structure of Pd–CeO₂ changed with increasing the temperature of reduction. Upon high temperature reduction, severe sintering of Pd particles occurred, while sintering of the ceria suppor...

Wen-Jie Shen, Atsuko Kobayashi, Yuichi Ichihashi, Yasuyuki Matsumura… in Catalysis Letters (2001)

Article

Structural change of palladium particles supported on cerium oxide in catalytic methanol synthesis

Ultrafine palladium particles supported on cerium oxide by the coprecipitation method effectively catalyzes the methanol synthesis from carbon monoxide and hydrogen, while the catalytic activity increases in t...

Yasuyuki Matsumura, Wen-Jie Shen, Yuichi Ichihashi, Hisanori Ando in Catalysis Letters (2000)

Article

Methanol synthesis from carbon monoxide and hydrogen catalyzed over Pd/CeO₂ prepared by the deposition–precipitation method

Ceria‐supported palladium catalysts prepared by the deposition–precipitation method are highly active for the methanol synthesis from carbon monoxide and hydrogen in comparison with the catalyst prepared by th...

Wen‐Jie Shen, Yuichi Ichihashi, Mitsutaka Okumura, Yasuyuki Matsumura in Catalysis Letters (2000)

Article

Synthesis of methanol over Pd promoted by ceria

Carbon monoxide and H₂ were allowed to react to produce methanol over Pd catalyst, and the effect of the supports was investigated. Among the supports examined, oxides of lanthanide such as La₂O₃, Pr₆O₁₁, Sm₂O₃, ...

Seiichiro Imamura, Katsuaki Denpo… in Reaction Kinetics and Catalysis Letters (1999)

Article

A kinetic study of methanol decomposition catalyzed over plate-type palladium catalyst

A kinetic study of the catalytic methanol decomposition to carbon monoxide and hydrogen has been carried out in the pressure range of methanol up to 8 atm at 200 and 250°C over a palladium catalyst supported o...

Shinji Shiizaki, Ikuo Nagashima, Yasuyuki Matsumura, Masatake Haruta in Catalysis Letters (1998)

Article

Photoluminescence properties of tetrahedral titanium oxide species in zeolitic materials

The photoluminescence spectra of the Y‐type zeolite modified with titanium ions and Ti‐silicalite‐1 have been investigated by varying the excitation energy. A three‐dimensional image of the photoluminescence s...

Yuichi Ichihashi, Hiromi Yamashita, Masakazu Anpo, Yoshie Souma… in Catalysis Letters (1998)

Article

An apparent ensemble effect in the oxidative coupling of methane on hydroxyapatites with incorporated lead

The introduction of small quantities of lead into calcium hydroxyapatite catalysts produces marked increases in the selectivity to C₂₊ hydrocarbons, while the conversion of methane remains relatively constant. Sm...

Yasuyuki Matsumura, Shigeru Sugiyama, Hiromu Hayashi, John B. Moffat in Catalysis Letters (1994)

Article

Oxidative methane conversion to carbon monoxide and hydrogen at low reactor wall temperatures over ruthenium supported on silica

Oxidative methane conversion to carbon monoxide and hydrogen is catalyzed over ruthenium supported on silica at reactor wall temperatures as low as 400° C when the flow rate of reactants (methane and oxygen) i...

Yasuyuki Matsumura, John B. Moffat in Catalysis Letters (1994)

Article

Dehydration ofn-butanol over highly dispersed heteropolyacid intercalation compounds

Heteropolyacid is introduced in an intercalation compound of zinc aluminum carbonate hydroxide by an anion-exchanging technique. The acid is probably present as H_2.1PW_9.2O^4.2− _33.3 and is shown to be highly dispe...

Keiji Hashimoto, Yasuyuki Matsumura, Masazumi Fukuchi, Yoshiya Kera in Catalysis Letters (1993)