新型双孔F-T合成钴基催化剂的制备及其性能

采用浸渍法制备了ZrO2改性的具有2种孔结构的硅胶催化剂载体，以其为基体制备了具有双孔结构的蛋壳型钴基催化剂，考察了其结构和催化性能. 结果表明，双孔结构的载体和相应的催化剂具有更好的比表面性能，ZrO2改性的双孔载体有利于提高催化剂的分散程度、催化活性及C5+选择性. 在温度250℃、压力2 MPa、空速500 h-1条件下，蛋壳型催化剂上CO转化率可达96.6%, C5+选择性为91.2%.

Preparation and Characterization of New Bimodal Porous Cobalt-based Catalyst for Fischer-Tropsch Synthesis

Bimodal porous support was modified with ZrO2 sols introduced into bigger pores of SiO2 gel pellets directly, then a eggshell cobalt-based catalyst based on the support was prepared. The structure and reduction property of the catalyst were characterized. The pores of obtained supports and catalyst distributed distinctly as two kinds of main pores. The results show that the BET specific surface area and pore volume of bimodal porous support as well as catalyst were increased compared with the original silica gel and catalyst. Bimodal porous support with additive ZrO2 was beneficial to improve dispersing degree, activity and selectivity for C5+ hydrocarbon of catalyst. The CO conversion rate reached 96.6%, and the selectivity for C5+ hydrocarbon was 91.2% under the conditions of temperature 250℃, pressure 2 MPa, and air space speed 500 h-1.