Silylation of SiO<sub>2</sub> and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis

SHI Li-hong; LI Xiao-feng; LI De-bao; SUN Yu-han

Volume 40 Issue 06

Jun. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(06): 737-742

SHI Li-hong, LI Xiao-feng, LI De-bao, SUN Yu-han. Silylation of SiO2 and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 737-742.

Citation:

SHI Li-hong, LI Xiao-feng, LI De-bao, SUN Yu-han. Silylation of SiO₂ and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 737-742.

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Silylation of SiO₂ and its influence on the properties of cobalt-based catalysts for Fischer-Tropsch synthesis

1.
School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China;
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
3.
Foreign Language Nomal College of Taiyuan University, Basic Department of Natural Science, Taiyuan 030012, China

Received Date: 2011-08-16
Rev Recd Date: 2011-11-08
Publish Date: 2012-06-30

Abstract

Abstract

Silylated SiO₂ with different hydrophobicities was prepared before the impregnation of cobalt precursor to obtain Co-based catalysts in Fischer-Tropsch synthesis. The effect of silylation on the crystallite structure and reduction behaviors of the resultant cobalt catalysts was investigated by FT-IR, ²⁹Si CP MAS NMR, N₂ sorption, XRD, Raman, XPS, and H₂-TPR; their catalytic performance in Fischer-Tropsch synthesis was evaluated in a fixed-bed reactor under 2.0 MPa, 240 ℃, n(H₂)/n(CO) ratio of 2, and space velocity (GHSV) of 1 000 h^-1. The results indicated that compared with unsilylated SiO₂, silylated SiO₂ leads to larger and more perfect Co₃O₄ crystallite, weaker interaction between cobalt and silica, and higher reducibility; As a result, the activity of cobalt catalysts is enhanced and higher CO conversion is achieved for Fischer-Tropsch synthesis.
- cobalt,
- SiO₂,
- silylation,
- hydrophobic,
- Fischer-Tropsch synthesis

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References(32)

References

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