Mass transfer limitations and kinetics studies were performed for Fischer-Tropsch Synthesis over spherical 10wt% Fe-10wt% Co-0.5wt% Pt/79.5wt% γ-Al2O3 catalyst in a fixed bed reactor. The external mass transfer limitation was checked by studying the effect of gas hourly space velocity (GHSV) and feed flow rate (at constant GHSV) on CO conversion. Theoretical and practical methods were applied to assess the effect of catalyst pellet size on the internal mass transfer limitation. The results indicated there is external diffusion limitation for GHSV lower than 4,200 h−1. Both the theoretical and practical methods showed that the reaction is free of internal diffusion limitation with average particle sizes of 0.21 and 0.42 mm due to Thiele modulus smaller than 0.4, denoting that the rate of reaction is kinetically controlled. The kinetics results demonstrated the combined enol and carbide mechanism-based model was able to provide a good fit for the experimental data.

中文翻译：

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Fe-Co-Pt/γ-Al2O3 催化剂的费-托合成：传质、动力学和机理研究

在固定床反应器中使用球形 10wt% Fe-10wt% Co-0.5wt% Pt/79.5wt% γ-Al2O3 催化剂对费托合成进行传质限制和动力学研究。通过研究气时空速 (GHSV) 和进料流速（在恒定 GHSV 下）对 CO 转化率的影响来检查外部传质限制。应用理论和实际方法来评估催化剂颗粒尺寸对内部传质限制的影响。结果表明，GHSV 的外部扩散限制低于 4,200 h-1。理论和实践方法均表明，由于蒂勒模量小于 0.4，该反应不受内部扩散限制，平均粒径分别为 0.21 和 0.42 mm，表明反应速率受到动力学控制。