Abstract The starting solvent is essential for carrying out Fischer-Tropsch (FT) synthesis in a stirred-tank reactor. The most commonly used solvents are C28+ hydrocarbon oils, wax, heavier wax, and FT wax. In general, FT activity of Co-based catalysts was found to decrease for initial days, and one of the reasons may be related to the filling of catalyst pores with heavier wax leading to lower gas diffusions and thus lower CO conversion. In this work, therefore, solvents with varying molecular weight and polarity, including glycerol, 1-octanol, Polywax-655, and dimethyl phthalate were tested as a starting medium for 0.27%Ag-25%Co/Al2O3 catalyst. It was found that low molecular weight non-polar solvent, for example, Polywax 655 showed higher conversions. On the other hand, glycerol a high polar solvent tends to firmly bound with a catalyst surface and the associated water produced during FT synthesis could trigger catalyst deactivation from the oxidation of cobalt. This indicates the superiority of non-polar over polar solvents for FT synthesis. However, 1-octanol as a starting solvent showed the least catalytic deactivation rate and competitive FTS activity. Thus, 1-octanol has the potential as a start-up solvent for FT reaction in stirred tank reactors.

中文翻译：

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启动溶剂对搅拌釜反应器费托合成钴催化剂性能的影响

摘要 起始溶剂对于在搅拌釜反应器中进行费托 (FT) 合成至关重要。最常用的溶剂是 C28+ 烃油、蜡、重蜡和 FT 蜡。一般来说，发现 Co 基催化剂的 FT 活性在最初几天会降低，其中一个原因可能与催化剂孔隙中填充较重的蜡有关，导致气体扩散降低，从而降低 CO 转化率。因此，在这项工作中，测试了具有不同分子量和极性的溶剂，包括甘油、1-辛醇、Polywax-655 和邻苯二甲酸二甲酯，作为 0.27%Ag-25%Co/Al2O3 催化剂的起始介质。发现低分子量非极性溶剂，例如，Polywax 655 表现出更高的转化率。另一方面，甘油是一种高极性溶剂，倾向于与催化剂表面牢固结合，并且在 FT 合成过程中产生的相关水会引发催化剂因钴氧化而失活。这表明非极性溶剂在 FT 合成方面优于极性溶剂。然而，1-辛醇作为起始溶剂表现出最低的催化失活率和竞争性 FTS 活性。因此，1-辛醇有可能作为搅拌釜反应器中 FT 反应的启动溶剂。