Effect of Different Reaction Conditions on the Deactivation of Alumina-Supported Cobalt Fischer鈥揟ropsch Catalysts in a Milli-Fixed-Bed Reactor: Experiments and Modeling

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• 作者：Majid Sadeqzadeh ; St茅phane Chambrey ; Jingping Hong ; Pascal Fongarland ; Francis Luck ; Daniel Curulla-Ferr茅 ; Daniel Schweich ; Jacques Bousquet ; Andrei Y. Khodakov
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 30, 2014
• 年：2014
• 卷：53
• 期：17
• 页码：6913-6922
• 全文大小：437K
• 年卷期：v.53,no.17(April 30, 2014)
• ISSN：1520-5045

文摘

This paper focuses on the deactivation of a cobalt-based alumina-supported Fischer鈥揟ropsch catalyst in a milli-fixed-bed reactor under different operating conditions. Different catalyst deactivation behaviors were observed at different syngas H₂/CO ratios and temperatures. The deactivation follows a two-step profile, where the initial deactivation is attributed to sintering, whereas the long-term deactivation is due to carbon deposition or cobalt oxidation on the surface. An unsteady-state semimechanistic model has been developed to represent the data at different temperatures and syngas ratios. This model takes into account cobalt sintering, coke deposition, and surface oxidation.