The deactivation rate of Co-Al2O3/SiO2 Fischer–Tropsch synthesis catalyst have been experimentally assessed at industrially relevant conditions (T 198–237 °C, P = 60 bar, H2/CO = 1.85, GHSV 2000–7000 h–1). The fresh and spent catalyst was characterized by XRD, XPS, BET, TEM, and SEM–EDX techniques. Decreasing active surface area due to cobalt oxidation by product water and sintering of cobalt crystallites were found to be minor factors for the deactivation. The principal reason of activity loss seems is diffusion limitations arising due to catalyst pores plugging by product wax. The linear dependence between gas flow rate and estimated catalyst lifetime was revealed. High GHSV of fresh synthesis gas and/or high circulation ratio of product gas should be employed to prevent rapid loss of catalyst activity.

中文翻译：

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Co-Al2O3/SiO2 费-托合成催化剂在工业相关条件下的失活

Co-Al2O3/SiO2 Fischer-Tropsch 合成催化剂的失活率已经在工业相关条件下进行了实验评估（T 198-237 °C，P = 60 bar，H2/CO = 1.85，GHSV 2000-7000 h-1）。使用 XRD、XPS、BET、TEM 和 SEM-EDX 技术对新鲜和废催化剂进行表征。发现由于产物水的钴氧化和钴微晶的烧结导致活性表面积的减少是失活的次要因素。活性损失的主要原因似乎是由于产物蜡堵塞催化剂孔而引起的扩散限制。揭示了气体流速和估计的催化剂寿命之间的线性相关性。应采用新鲜合成气的高 GHSV 和/或产品气的高循环比，以防止催化剂活性的快速损失。