Poisoning of a Silica-Supported Cobalt Catalyst due to Presence of Sulfur Impurities in Syngas during Fischer鈥揟ropsch Synthesis: Effects of Chelating Agent

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• 作者：Ashish S. Bambal ; Vidya S. Guggilla ; Edwin L. Kugler ; Todd H. Gardner ; Dady B. Dadyburjor
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：5846-5857
• 全文大小：519K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

The effects of sulfur impurities on the performance of cobalt-based Fischer鈥揟ropsch catalysts are evaluated under industrially relevant operating conditions of temperature, pressure, and impurity levels. Chelating agents (CAs) were used to modify the SiO₂ support, and the performances of the CA-modified catalysts are compared with conventional Co/SiO₂ catalysts. For both the Co/SiO₂ and CA-modified catalysts, the presence of sulfur in the inlet syngas results in a notable drop in the CO conversion, an undesired shift in the hydrocarbon selectivity toward short-chain hydrocarbons, more olefins in the products, and lower product yields. In the post-poisoning stage, i.e., after termination of sulfur introduction in the inlet syngas, the CA-modified catalysts recover activity and selectivity (to some extent at least), whereas such trends are not observed for the base-case, i.e., unmodified Co/SiO₂ catalyst. The improved performance of the CA-modified catalysts in the presence of sulfur is attributed to higher densities of active sites.