Co/Al_2O_3-SiO_2催化剂的F-T反应性能的研究

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。

Study on the F-T reaction performance of Co/Al2O3-SiO2 catalyst

The γ-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.