干燥温度对Co/SiO_2费托合成催化剂结构和性能的影响

Effects of dry temperature on the structure and properties of Co/SiO_2 catalyst for Fischer-Tropsch synthesis

采用浸渍法制备了钴负载质量分数15%的Co/SiO_2催化剂,考察干燥温度对催化剂性能的影响。随着干燥温度升高,催化剂活性先增大后减小,但对产物选择性没有明显影响。BET、SEM、XRD和H_2-TPR测定结果表明,改变干燥温度可以影响钴在催化剂中的分布状态,从而使催化剂结构、晶粒度和还原性能发生相应变化,这些效应的叠加导致干燥温度90℃时制备的Co/SiO_2催化剂具有最好的反应活性。

Co/SiO2 catalysts with 15% Co（ mass fraction） were prepared by impregnation method and characterized by BET, SEM, XRD and H2-TPR. The effects of dry temperature on the performance of the catalysts for Fischer-Tropsch synthesis were investigated. The results showed that the catalyst activity first increased and then decreased with the increase of dry temperature, and had no evidently influence on the selectivity tO the product;the change of dry temperature could influence on Co distribution in the catalysts, and then the structure, crystal size and reducibility of the catalysts had correspondingly change. Co/ SiO2 catalyst dried at 90℃ exhibited the highest activity.