A series of model Fischer-Tropsch synthesis (FTS) catalyst granules with different thermal conductivity were prepared to study the influence of catalyst granule thermal conductivity on FTS performance. A clear correlation was found between catalyst granule thermal conductivity and FTS activity, CH₄ selectivity, C₅₊ selectivity, mole ratio of olefin to paraffin and branched hydrocarbon selectivity at high CO conversion. This could be due to that the overheating effect occurred within catalyst granule with low thermal conductivity. On the basis of the widely accepted ‘alkyl’ mechanism for FTS, the overheating effect was able to affect the adsorption of H₂ and CO molecules, the hydrogenation of carbide species as well as chain growth. In addition, the overheating effect could lead to the catalyst structure reconstruction, sintering and deactivation.

制备了一系列具有不同导热系数的费-托合成模型（FTS）催化剂颗粒，以研究催化剂颗粒导热率对FTS性能的影响。发现在高CO转化率下，催化剂颗粒的导热率与FTS活性，CH ₄选择性，C ₅₊选择性，烯烃与链烷烃的摩尔比和支链烃选择性之间存在明显的相关性。这可能是由于在具有低导热率的催化剂颗粒内发生了过热效应。在广泛认可的FTS“烷基”机理的基础上，过热效应能够影响H ₂的吸附。和CO分子，碳化物物种的氢化以及链增长。另外，过热效应可能导致催化剂结构的重建，烧结和失活。