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- W2048551951 abstract "Hydrogen production by partial oxidation of methanol (CH3OH+1/2O2↔2H2+CO2) was studied over zinc oxide-supported Pd catalysts. Catalyst performance was investigated as a function of the Pd loading and pretreatment in hydrogen environment under feed ratios O2/CH3OH (molar) of 0.3 and 0.5 at 503–543 K. High yields of hydrogen were obtained under integral operation regime. The hydrogen selectivity showed a strong dependence on the methanol conversion, which suggests that oxidation and reforming steps take place consecutively. Catalyst characterization by temperature-programmed reduction, X-ray diffraction, and X-ray photoelectron spectroscopy revealed that PdZn alloys can be formed upon reduction at moderate temperatures. A shift of +0.7 eV has been observed in the binding energy of Pd 3d5/2core level spectrum of catalyst 1% Pd/ZnO prereduced at temperatures as low as 373 K and catalyst 5% Pd/ZnO reduced at 573 K and above. The relative ease with which PdZn alloy is formed in 1% Pd/ZnO catalyst is explained in terms of a stronger metal–metal oxide interactions of the smaller Pd particles. PdZn alloys were also detected by X-ray diffraction on the 2% Pd/ZnO catalyst after on-stream operation. Pretreatments of the catalysts in hydrogen at high temperatures led to sintering of metallic particles with the subsequent drop in methanol conversion." @default.
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- W2048551951 date "1998-10-01" @default.
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- W2048551951 title "Selective Production of Hydrogen by Partial Oxidation of Methanol over ZnO-Supported Palladium Catalysts" @default.
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- W2048551951 doi "https://doi.org/10.1006/jcat.1998.2184" @default.
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