Preparation of high thermal conductivity SiO<sub>2</sub>@Al support and its application in Fischer-Tropsch synthesis

ZHANG Tian-peng; WANG Jun-gang; ZHANG Ri-guang; CHEN Cong-biao; JIA Li-tao; LI De-bao; HOU Bo

doi:10.19906/j.cnki.JFCT.2021050

Volume 49 Issue 8

Aug. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(8): 1140-1147

ZHANG Tian-peng, WANG Jun-gang, ZHANG Ri-guang, CHEN Cong-biao, JIA Li-tao, LI De-bao, HOU Bo. Preparation of high thermal conductivity SiO2@Al support and its application in Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1140-1147. doi: 10.19906/j.cnki.JFCT.2021050

Citation:

ZHANG Tian-peng, WANG Jun-gang, ZHANG Ri-guang, CHEN Cong-biao, JIA Li-tao, LI De-bao, HOU Bo. Preparation of high thermal conductivity SiO₂@Al support and its application in Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1140-1147. doi: 10.19906/j.cnki.JFCT.2021050

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Preparation of high thermal conductivity SiO₂@Al support and its application in Fischer-Tropsch synthesis

doi: 10.19906/j.cnki.JFCT.2021050

ZHANG Tian-peng^{1, 2
,},
WANG Jun-gang¹,
ZHANG Ri-guang³,
CHEN Cong-biao¹,
JIA Li-tao^{1, 4},
LI De-bao^{1, 4},
HOU Bo^{1
,
,}

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
4.
Dalian National Laboratory for Clean Energy, CAS, Dalian 116023, China

Funds: The project was supported by the National Natural Science Foundation of China (21872162, 21902170), the Key Research Project of Shanxi Province (201903D121033) and the Key Laboratory of Coal Science and Technology, Taiyuan University of Technology (MKX201902)

Received Date: 2021-02-09
Rev Recd Date: 2021-03-09

Available Online: 2021-03-29

Publish Date: 2021-08-31

Abstract

Abstract

High thermal conductivity supports, core-shell structure SiO₂@Al, was successfully prepared by hydrolyzing tetraethyl orthosilicate (TEOS) under weak alkaline condition and using hexadecyl trimethyl ammonium bromide (CTAB) as the template. 15% (mass fraction) of cobalt was loaded on these supports by excessive impregnation method for Fischer-Tropsch synthesis reaction. The prepared catalysts have high metal aluminum content, high specific surface shell layer and relatively uniform pore size of 2.6−2.8 nm. By changing the added amount of TEOS, the content of silica in the supports and the thickness of the shell layer can be adjusted. As the thickness of the silica shell layer increases, the specific surface area of the supports gradually increases, the interaction between cobalt and the supports increases, and at the same time, the reduction degree of the catalysts decreases. The silica shell enhances the dispersion of metallic cobalt and avoids deactivation caused by agglomeration of metallic cobalt on aluminum particles. Under the condition of similar conversion rate, the catalyst 15Co/5-SiO₂@Al with a thinner shell layer has the best performance in Fischer-Tropsch synthesis which is mainly due to the moderate metal-support interaction between the thin silica shell layer and metal cobalt particles. The thinner silica shell layer can anchor and disperse cobalt species to increase the reduction degree of cobalt species.
- high thermal conductivity,
- core-shell structure,
- Fischer-Tropsch synthesis

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References(27)

References

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