Effect of process conditions on the product distribution of Fischer-Tropsch synthesis over a Re-promoted cobalt-alumina catalyst using a stirred tank slurry reactor

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• 作者：Branislav Todic ; Wenping Ma ; Gary Jacobs ; Burtron H. Davis ; Dragomir B. Bukur
• 关键词：Fischer&ndash ; Tropsch synthesis ; Slurry reactor ; Process conditions ; Product selectivity ; Cobalt catalyst ; Rhenium promoter
• 刊名：Journal of Catalysis
• 出版年：March, 2014
• 年：2014
• 卷：311
• 期：Complete
• 页码：325-338
• 全文大小：3247 K

文摘

The effects of process conditions on Fischer-Tropsch synthesis (FTS) product distribution were studied using a 1-L stirred tank slurry reactor and a 0.48%Re-25%Co/Al₂O₃ catalyst. It was found that the chain growth probability of C₁ intermediate (伪₁) has the most dominant effect on CH₄ and C₅₊ selectivity. 伪₁ was found to be highly dependent on process conditions. Relatively constant values of C₂₊ growth probabilities with reactor residence time, as well as other process variables, suggest that 1-olefin readsorption has a minor effect on product selectivities. A low value of 伪₁ and its different response to variations in process conditions, compared to higher chain growth probabilities, seems to support a hypothesis that a higher-than-expected yield of methane is caused by at least two separate methane formation pathways. Understanding these pathways and ways to suppress excess methane formation is a key factor in obtaining higher C₅₊ selectivity.