Fischer-Tropsch synthesis: The role of pore size for Co/SBA-15 catalysts

被引:142
作者
Xiong, Haifeng [1 ]
Zhang, Yuhua [1 ]
Liew, Kongyong [2 ,3 ]
Li, Jinlin [1 ,2 ,3 ]
机构
[1] Suzhou Univ, Sch Chem & Chem Engn, Suzhou 215006, Peoples R China
[2] S Cent Univ Nationalities, Key Lab Catalysis & Mat Sci, State Ethn Affairs Commiss, Wuhan, Peoples R China
[3] S Cent Univ Nationalities, Minist Educ, Wuhan, Peoples R China
基金
中国国家自然科学基金;
关键词
Fischer-Tropsch synthesis; Pore size; Cobalt catalysts; SBA-15;
D O I
10.1016/j.molcata.2008.08.017
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Co/SBA-15 (30 wt.%) catalysts with different pore sizes were prepared from the same materials by incipient wetness impregnation and characterized by diffuse reflectance infrared Fourier transform spectroscopy, N-2 adsorption-desorption, X-ray diffractometry, temperature-programmed reduction and H-2 desorption, oxygen titration as well as transmission electron microscopy. The reduction of the catalysts took place in two stages with CO3O4 reduction to CoO and then to Co-0. The first stage reduction was facile regardless of the catalyst Pore size while the second stage reduction was much easier on the catalysts with larger pore. After the reduction, cobalt particles were found to be distributed on both the exterior and interior surfaces of the support. Compared to the catalyst with smaller pores, larger pore catalysts have more adsorption sites for CO of both the linear and bridge types, The catalysts with larger pore led to larger cobalt cluster size, lower dispersion and higher reducibility. The larger pores gave rise to more adsorbed CO of the bridge-type on FTS. CO conversion increased and then decreased with the pore size in the range studied. The catalysts with larger cobalt cluster size showed higher C5+ selectivity for the FTS.. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:68 / 76
页数:9
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