Selective removal of CO from hydrogen-rich stream over CuO/Ce_xSn_1−xO₂–Al₂O₃ catalysts

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• 作者：Yin-Zu Chen ; Biing-Jye Liaw ; Jung-Man Wang ; Ching-Tsuen Huang
• 关键词：CO ; Selective oxidation ; CuO catalyst ; CeO₂ oxide ; Ce_xSn₁₋ ; _xO₂– ; Al₂O₃ mixed oxides
• 刊名：International Journal of Hydrogen Energy
• 出版年：2008
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May 2008
• 卷：33
• 期：9
• 页码：2389-2399
• 文件大小：882 K

摘要

The solid solutions of Ce_xSn_1−xO₂ incorporated with alumina to form Ce_xSn_1−xO₂–Al₂O₃ mixed oxides, by the suspension/co-precipitation method, were used to prepare CuO/Ce_xSn_1−xO₂–Al₂O₃ catalysts for the selective oxidation of CO in excess hydrogen. Incorporating Al₂O₃ increased the dispersion of Ce_xSn_1−xO₂, but did not change their main structures and did not weaken their redox properties. Doping Sn⁴⁺ into CeO₂ increased the mobility of lattice oxygen and enhanced the activity of the 7%CuO/Ce_xSn_1−xO₂–Al₂O₃ catalyst in the selective oxidation of CO. The selective oxidation of CO was weakened as the doped fraction of Sn⁴⁺ exceeded 0.5. Incorporating appropriate amounts of Sn⁴⁺ and Al₂O₃ could obtain good candidates 7%CuO/Ce_xSn_1−xO₂–Al₂O₃(20%), 1–x=0.1–0.5, for a preferential oxidation (PROX) unit in a polymer electrolyte membrane fuel cell system for removing CO. Its activity was comparable with, and its selectivity was much larger than, that of the noble catalyst 5%Pt/Al₂O₃.