Production of hydrogen by steam reforming of methanol over copper-based catalysts: The effect of cesium doping

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• 作者：A. Houteit ; H. Mahzoul ; P. Ehrburger ; P. Bernhardt ; P. Lé ; garé ; and F. Garin
• 关键词：Methanol reforming ; Steam reforming ; Hydrogen production ; Copper ; Cesium
• 刊名：Applied Catalysis A: General
• 出版年：2006
• 出版时间：7 June 2006
• 年：2006
• 卷：306
• 期：Complete
• 页码：22-28
• 全文大小：298 K

文摘

The catalytic production of hydrogen by steam reforming of methanol was investigated using samples of copper oxide supported on alumina (Cu/Al₂O₃) and promoted with cesium (Cu-Cs/Al₂O₃). The effects of cesium content and reaction temperature on the catalytic activity were investigated. The Cu-Cs/Al₂O₃ catalysts exhibited higher activity and stability as compared to the undoped ones. The catalyst containing 2 wt % of cesium was the most active and at 300 °C the methanol conversion reached 94 mol % and the hydrogen selectivity 97 mol % with no detectable formation of CO. After an ageing treatment at 400 °C, methanol conversion was still close to 100 % with the cesium-doped catalyst, while the undoped catalyst drastically deactivated. X-ray powder diffraction (XRD) and XPS measurements indicate that cesium prevents the reduction of copper oxide into metallic Cu, by the hydrogen produced, and inhibits the formation of CuAl₂O₄ spinel upon thermal treatment.