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Effect of start-up solvent on the performance of Co catalyst for Fischer-Tropsch synthesis in stirred-tank reactor

机译：助剂对搅拌釜反应器费-托合成钴催化剂性能的影响

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摘要

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.
机译：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。通常，发现钴基催化剂的FT活性在开始的几天中下降，原因之一可能与用较重的蜡填充催化剂孔导致较低的气体扩散并因此降低了CO转化率有关。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，作为起始介质用于0.27％Ag-25％Co / Al2O3催化剂。发现低分子量非极性溶剂，例如Polywax 655，显示出更高的转化率。另一方面，作为高极性溶剂的甘油倾向于与催化剂表面牢固结合，并且在FT合成过程中产生的伴生水可能触发催化剂因钴的氧化而失活。这表明在FT合成中非极性溶剂优于极性溶剂。然而，以1-辛醇为起始溶剂显示出最小的催化失活速率和竞争性的FTS活性。因此，1-辛醇具有在搅拌釜反应器中作为FT反应的启动溶剂的潜力。

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  • 来源
    《Fuel》 |2020年第jul15期|117707.1-117707.8|共8页
  • 作者

  • 作者单位

    Univ Kentucky Ctr Appl Energy Res 2540 Res Pk Dr Lexington KY 40511 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fischer-Tropsch; Starting solvent; CSTR; Cobalt; Polar solvents; Polywax;

    机译：费-托;起始溶剂;CSTR;钴;极性溶剂;聚乙烯蜡;

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