Catalytic Combustion of Methane over Co_1−xMg_xO/Al₂O₃/FeCrAl Monolithic Catalysts

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• 作者：Liping Zhao ; Shengfu Ji ; Fengxiang Yin ; Zexiang Lu ; Hui Liu ; Chengyue Li
• 关键词：catalytic combustion ; methane ; metallic monolithic catalyst ; XRD ; SEM ; TPR
• 刊名：Journal of Natural Gas Chemistry
• 出版年：2006
• 出版时间：December 2006
• 年：2006
• 卷：15
• 期：4
• 页码：287-296
• 全文大小：1650 K

文摘

A series of Co_1−xMg_xO/Al₂O₃/FeCrAl catalysts (x=0−1) were prepared. The structures of the catalysts were characterized using XRD, SEM, and TPR analyses. The catalytic activity of the catalysts for methane combustion was evaluated in a continuous flow microreactor. The results indicated that the active washcoats adhered well on the FeCrAl foils. The phases in the catalysts were Co_1−xMg_xO solid solutions, α-Al₂O₃, and γ-Al₂O₃. The surface particle size of the catalysts varied with variations in the molar ratios of Co to Mg. The Co component of the Co_1−xMg_xO/Al₂O₃/FeCrAl catalysts played an important role in the catalytic activity for methane combustion. In the Co_1−xMg_xO/Al₂O₃/FeCrAl (x=0.2−0.8), the catalytic activity in terms of x was in the order of 0.5>0.2>0.8 under the experimental conditions. The presence of Mg in these catalysts could promote the thermal stability to a large extent. There were strong interactions between the Co_1−xMg_xO and the Al₂O₃/FeCrAl supports.