Co/Al_2O_3-SiO_2催化剂的F-T反应性能的研究

Study on the F-T reaction performance of Co/Al_2O_3-SiO_2 catalyst

通过浸渍法制备不同含量SiO_2改性的Co/Al_2O_3催化剂,结合N2吸附-脱附、XRD、H2-TPR、XPS等表征手段,研究SiO_2助剂对钴基催化剂物相结构、还原行为及F-T合成性能的影响。结果表明,适量的SiO_2改性后,有效地减弱了载体与活性组分钴之间的相互作用,显著地提高了催化剂的还原度和催化活性。但继续增加SiO_2的含量,催化剂的还原度继续提高,分散度同时下降32%,与未改性之前相比,催化剂的活性基本没有改变。

Theγ-Al2O3 modified with different content of SiO2 by impregnation method was used as supports to prepare Co/Al2O3 catalyst.The effects of SiO2 additives on phase structure of the cobalt-based catalysts,reduction behavior and the influence on the F-T synthesis performance were studied by using N2 adsorption,XRD,H2-TPR and XPS characterization methods and activity test.The results showed that with the introduction of SiO2,the interaction between support and cobalt was effectively weakened,thus the reducibility and catalytic activity of the catalysts were significantly improved.However,when the amount of SiO2 continued to increase,the reduction degree of the catalyst continued to improve,but the dispersion decreased by 32%at the same time.Compared with unmodified Co/Al2O3 catalyst,the activity of the catalyst remained basically unchanged.