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Effects of macropores on reducing internal diffusion limitations in Fischer–Tropsch synthesis using a hierarchical cobalt catalyst

机译：大孔对降低费-托合成钴催化剂的内部扩散限制的影响

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Internal diffusion limitations in Fischer–Tropsch catalysts strongly affects their catalytic activities and product selectivities. Large pellet catalysts demonstrate especially severe internal diffusion limitations in fixed bed reactors. In order to overcome this problem, macropores were introduced into cobalt catalysts, and the resulting effects on reaction activity and selectivity were studied. Meso–macroporous silica (S1) with mesoporous walls was prepared by a sol–gel process and was used to prepare the Co/S1 catalyst. A bimodal mesoporous silica (S2) support with an equivalent mesopore diameter to the S1 support was also prepared for comparison. The effects of internal diffusion limitations in the S1 and S2 supports with different pellet sizes on FT synthesis were investigated. The results showed that the macropores played an important role in reducing internal diffusion limitations, especially for large pellet catalysts.
机译：费-托催化剂的内部扩散限制极大地影响了它们的催化活性和产物选择性。大型颗粒催化剂在固定床反应器中表现出特别严重的内部扩散限制。为了克服这个问题，将大孔引入钴催化剂中，并研究了其对反应活性和选择性的影响。具有中孔壁的介孔大分子二氧化硅（S1）是通过溶胶-凝胶法制备的，并用于制备Co / S1催化剂。还准备了具有与S1载体等效的中孔直径的双峰中孔二氧化硅（S2）载体进行比较。研究了不同颗粒尺寸的S1和S2载体内部扩散限制对FT合成的影响。结果表明，大孔在降低内部扩散限制方面起着重要作用，特别是对于大型颗粒催化剂。

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