葡萄糖和Pd对钴基费托合成催化剂结构和性能的影响

采用等体积浸渍法制备SiO_2负载的钴基催化剂,利用N_2低温吸附、XRD、SEM和H_2-TPR等方法表征了在浸渍操作中添加葡萄糖和助剂Pd对催化剂结构和性质的影响,并在固定床反应器中评价了催化剂的费托合成反应性能。葡萄糖和Pd能够改变Co_3O_4晶粒形状,添加葡萄糖提高了Co_3O_4的分散程度,助剂Pd促进了Co_3O_4还原。两者的联合使用则同时提高了钴物种分散度和还原度,从而改善了催化剂的费托合成反应活性和C_(5+)烃选择性。

Effects of glucose and Pd on the structure and performance of cobalt-based catalyst for F-T synthesis

Co-based catalyst was prepared by impregnation method with SiO₂ as the support. The effects of glucose and Pd on the structure and property of the catalysts were characterized by N₂ low-temperature adsorption, XRD, SEM and H₂-TPR. The reactive performance of the catalysts in F-T synthesis was evaluated in a fixed-bed reactor. The shape of Co₃O₄ crystal particle was changed by the added glucose and Pd. The addition of glucose increased the dispersion of Co₃O₄ species, and the addition of Pd promoted the reduction of the catalyst although its dose was only 0.0125%. The combination of glucose and Pd increased the dispersion and reduction of Co₃O₄ species on the catalysts simultaneously. As the result, both of the CO conversion and the selectivity of C₅₊ hydrocarbons increased in F-T synthesis reaction.