Activity and stability of a novel Ru modified Ni catalyst for hydrogen generation by supercritical water gasification of glucose

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• 作者：Linghong Zhang^a ; Chunbao (Charles) Xu^b ; ^cxu6@uwo.ca ; Pascale Champagne^a ; ^c ; ^{champagne@civil.queensu.ca}
• 关键词：Supercritical water gasification (SCWG) ; Hydrogen generation ; Nickel catalysts ; Ruthenium modifier ; Stability
• 刊名：Fuel
• 出版年：2012
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：June, 2012
• 卷：96
• 期：Complete
• 页码：541-545
• 文件大小：634 K

摘要

The activities and stabilities of 纬-Al₂O₃ supported Ni catalysts (Ni10/纬-Al₂O₃ and Ru_0.1Ni10/纬-Al₂O₃) for hydrogen generation through the supercritical water gasification (SCWG) of glucose were investigated at 700 掳C, 24 MPa and a weight hourly space velocity (WHSV) of 6 h^鈭? in a bench-scale continuous down-flow tubular reactor. The Ru_0.1Ni10/纬-Al₂O₃ catalyst (10 wt.%Ni, the Ru-to-Ni molar ratio of 0.1) exhibited higher activity and stability than Ni10/纬-Al₂O₃ (10 wt.%Ni). With the Ru_0.1Ni10/纬-Al₂O₃ catalyst, negligible catalyst deactivation was observed over a period of 33 h on stream. The H₂ yield was maintained as high as 鈭?0 mol/kg glucose throughout the entire stability test. In contrast, the activity of Ni10/纬-Al₂O₃ catalyst (10 wt.%Ni) decreased after approximately 7 h on stream, accompanied by a marked decrease in the H₂ yield from 鈭?0 mol/kg glucose initially to 鈭?5 mol/kg glucose after 7 h. The temperature-programmed reduction (TPR) and H₂ chemisorption analyses on the fresh catalysts demonstrated that the addition of a small amount of Ru as a modifier could improve Ni dispersion, which could account for the enhanced activity and higher stability of the Ru_0.1Ni10/纬-Al₂O₃ catalyst.