A New Way to Look at Fischer鈭扵ropsch Synthesis Using Flushing Experiments

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• 作者：Xiaojun Lu ; Xiaowei Zhu ; Diane Hildebrandt ; Xinying Liu ; David Glasser
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：April 20, 2011
• 年：2011
• 卷：50
• 期：8
• 页码：4359-4365
• 全文大小：941K
• 年卷期：v.50,no.8(April 20, 2011)
• ISSN：1520-5045

文摘

When Fischer鈭扵ropsch synthesis (FTS) reaction experiments were conducted in a gas鈭抯olid system with a TiO₂-supported cobalt catalyst in a continuous stirred tank reactor (CSTR), we observed significant changes in the reaction rate and product selectivity at an early stage of time on stream (TOS) when all the reaction conditions were kept constant.(1) We designed flushing experiments with an inert gas that started when the FTS reaction had reached steady state. After the completion of flushing, the FTS reaction was resumed with syngas. We then compared the results of the FTS reaction rate and product selectivity both before and after flushing. The flushing experimental results suggested that the marked variations we observed were caused (either wholly or mainly) by liquid products deposited in the catalyst rather than by the change in the properties of the catalyst surface. The concentrations and the relative amount of the reactant in the flushed out stream were examined and the implications of the high H₂/CO ratio for the reaction kinetics and product selectivity are discussed. On the basis of the dynamic concentrations of C₁鈭扖₈ in the flushed outgas, we propose that reaction among the products takes place under moderate FTS reaction conditions.