文献类型：期刊文献

英文题名：Effect of vacuum impregnation on the performance of Co/SiO₂ Fischer-Tropsch catalyst

作者：Zhou, Xiaofeng[1];Chen, Qingling[2];Tao, Yuewu[2];Weng, Huixin[1]

机构：[1]E China Univ Sci & Technol, Res Ctr Petr Proc, Shanghai 200237, Peoples R China;[2]SINOPEC, Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

年份：2011

卷号：20

期号：4

起止页码：350

外文期刊名：JOURNAL OF NATURAL GAS CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000293939600003)】；

基金：The authors would like to acknowledge the financial support of Shanghai Research Institute of Petrochemical Technology, SINOPEC.

语种：英文

外文关键词：Fischer-Tropsch synthesis; cobalt catalysts; silica; vacuum impregnation

摘要：Two silica-supported cobalt catalysts were prepared by incipient wetness impregnation under atmospheric and vacuum conditions. N-2 physisorption, H-2 chemisorption, XRD, SEM, TEM, XPS and H-2-TPR were used to characterize the catalysts. The results showed that the impregnation methods had an effect on the size, dispersion and reducibility of cobalt particles. Under vacuum conditions, cobalt-containing steeping liquor could penetrate into the inner pores of silica support and more bivalent cobalt oxides were formed in the Co3O4 crystallites. Furthermore, cobalt precursors were rarely inclined to agglomerate and the smaller cobalt particles were uniform on the support, which led to the higher activity of the Co/SiO2 (B) catalyst than the normal one under the reaction conditions of 483-523 K, 1-2 MPa, gas hourly space velocity of 500-1000 h(-1) and molar ratio of H-2/CO = 0.5-2.0.