蒸汽重整
水煤气变换反应
甲醇
催化作用
一氧化碳
水煤气
格式化
氢
化学工程
无机化学
吸附
脱氢
反应速率
反应机理
化学
甲醇重整装置
制氢
合成气
物理化学
有机化学
工程类
作者
Brant A. Peppley,J. C. Amphlett,Lyn M. Kearns,R. F. Mann
标识
DOI:10.1016/s0926-860x(98)00299-3
摘要
Surface mechanisms for methanol–steam reforming on Cu/ZnO/Al2O3 catalysts are developed which account for all three of the possible overall reactions: methanol and steam reacting directly to form H2 and CO2, methanol decomposition to H2 and CO and the water-gas shift reaction. The elementary surface reactions used in developing the mechanisms were chosen based on a review of the extensive literature concerning methanol synthesis on Cu/ZnO/Al2O3 catalysts and the more limited literature specifically dealing with methanol–steam reforming. The key features of the mechanism are: (i) that hydrogen adsorption does not compete for the active sites which the oxygen-containing species adsorb on, (ii) there are separate active sites for the decomposition reaction distinct from the active sites for the methanol–steam reaction and the water-gas shift reaction, (iii) the rate-determining step (RDS) for both the methanol–steam reaction and the methanol decomposition reaction is the dehydrogenation of adsorbed methoxy groups and (iv) the RDS for the water-gas shift reaction is the formation of an intermediate formate species. A kinetic model was developed based on an analysis of the surface mechanism. Rate data were collected for a large range of conditions using a fixed-bed differential reactor. Parameter estimates for the kinetic model were obtained using multi-response least squares non-linear regression. The resultant model was able to accurately predict both the rates of production of hydrogen, carbon dioxide and of carbon monoxide for a wide range of operating conditions including pressures as high as 33 bar.
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