Investigation of H2O and CO2 Reforming and Partial Oxidation of Methane: Catalytic Effects of Coal Char and Coal Ash

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• 作者：Hongcang Zhou ; Yan Cao ; Houyin Zhao ; Hongying Liu ; Wei-Ping Pan
• 刊名：Energy & Fuels
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：22
• 期：4
• 页码：2341 - 2345
• 全文大小：1191K
• 年卷期：v.22,no.4(July 2008)
• ISSN：1520-5029

文摘

Methane reforming and partial oxidation was studied to evaluate the catalytic effects of coal chars and coal ashes on methane (CH₄) conversion, sum selectivity (the sum of H₂ and CO), and ratio selectivity (the ratio of H₂/CO) in an atmospheric fluidized bed. The kinetics study presented the possibility of CH₄ reforming and partial oxidation with a favorable H₂/CO ratio, greater than 5. The higher H₂/CO ratio in CH₄ reforming and the partial-oxidation process can reduce the consumption of CH₄ needed to adjust the H₂/CO ratio during combined coal gasification and methane reforming. Coal ashes failed to be good candidates of catalysts on CH₄ reforming and partial oxidation because of their very low specific surface area available for catalytic reactions. However, coal chars presented very promising catalytic performance on CH₄ reforming and partial oxidation because of their larger specific surface area. In this study, no other constituents in coal fly ash or special surface properties of coal chars were correlated with the enhanced methane-conversion efficiency. It seems that the specific surface area is only variable in controlling methane-conversion efficiency.