Preparation of activated carbon supported Fe-Al₂O₃ catalyst and its application for hydrogen production by catalytic methane decomposition

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• 作者：Lijun Jin ; Huanhuan Si ; Jianbo Zhang ; Ping Lin ; Zhiyuan Hu ; Bo Qiu ; Haoquan Hu
• 关键词：Methane decomposition ; Hydrogen ; Activated carbon ; Fe&ndash ; Al2O3 catalyst ; Mesopore
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：21 August, 2013
• 年：2013
• 卷：38
• 期：25
• 页码：10373-10380
• 全文大小：1540 K

文摘

Activated carbon (AC) supported Fe-Al₂O₃ catalysts were prepared by impregnation method and used for catalytic methane decomposition to hydrogen. The XRD and H₂-TPR results showed that ferric nitrate on AC support was directly reduced to Fe metal by the reducibility of carbon at 870?¡ãC. The loading amount and Fe/Al₂O₃ weight ratio affect the textural properties and catalytic methane decomposition. The surface area and pore volume of the catalyst decrease with the loading of Fe and Al₂O₃. Mesopores with size of about 4.5?nm can be formed at the loading of 20-60 % and promote the catalytic activity and stability. The mesopores formation is thought that Fe accelerates burning off of carbon wall and enlarging pore sizes during the pretreatment. When the Fe/Al₂O₃ ratio is 16/24 to 24/16 at the loading of 40 % , the resultant catalysts show narrow mesopore distributions and relative high methane conversion. Al₂O₃ as the promoter can improve catalytic activity and shorten transitional period of AC supported Fe catalyst.