Citation: LI Xiao-feng, ZHAO Jun-xiu, SHI Li-hong. Hydrophobic modification of SBA-15 and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(4): 455-460. shu

Hydrophobic modification of SBA-15 and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis

1.
1. Department of Basic Courses, Foreign Language Normal College of Taiyuan University, Taiyuan 030012, China;

Corresponding author: SHI Li-hong,
Received Date: 19 November 2013
Available Online: 22 January 2014
Fund Project: 国家自然科学基金青年项目 (21306108) (21306108)山西省自然科学基金 (2013011009-5) (2013011009-5)

SBA-15 supports modified by different hydrophobic reagents (methyltriethoxysilane, dimethyldiethoxysilane and chlorotrimethylsilane) were prepared before the impregnation of cobalt precursor. The effects of hydrophobic modification on the crystallite structure and the reduction behaviors were studied by BET, FT-IR, ²⁹Si CP MAS NMR, XRD, and H₂-TPR. Fischer-Tropsch (F-T) synthesis performances were evaluated in a fixed-bed reactor at 2.0 MPa, 200~250 ℃, H₂/CO (volume ratio)=2, and GHSV=1 000 h^-1. The result indicated that hydrophobic modification led to the increase in reduction degree of the supported cobalt, resulting in the increase of CO conversion of cobalt catalysts for F-T synthesis. Moreover, due to the increase of Co₃O₄ crystallite size and the decrease of un-reducible cobalt compound after hydrophobic modification, CH₄ selectivity decreased and C₅₊ selectivity increased.
- cobalt catalyst,
- SBA-15,
- hydrophobic modification,
- Fischer-Tropsch synthesis
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