Citation: LIANG Kun, ZHANG Cheng-hua, XIANG Hong-wei, YANG Yong, LI Yong-wang. Effects of modified SiO₂ on H₂ and CO adsorption and hydrogenation of iron-based catalysts[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(7): 769-779. shu

Effects of modified SiO₂ on H₂ and CO adsorption and hydrogenation of iron-based catalysts

LIANG Kun ^1,2 ,
ZHANG Cheng-hua ^3,, ,
XIANG Hong-wei ^1,3 ,
YANG Yong ^1,3 ,
LI Yong-wang ^1,3

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.
SynfuelsChina Co. Ltd, Beijing 101407, China

Corresponding author: ZHANG Cheng-hua, zhangchh@sxicc.ac.cn
Received Date: 19 March 2019
Revised Date: 24 April 2019

Fund Project: The project was supported by the Major Research Program of National Natural Science Foundation of China (91545109)the Major Research Program of National Natural Science Foundation of China 91545109

Figures(10)

Metal-modified SiO₂ supports were prepared by sol-gel method with Mn, Zn, Zr, and Sr cations doping, and then iron-based catalysts supported on modified SiO₂ were prepared by the impregnation method. The iron-based catalysts were characterized by XRD, N₂ adsorption, and XPS. The reduction adsorption property of H₂ and hydrogenation property of CO were studied by temperature programmed methods. The interaction between catalyst and H was studied by kinetic analysis. The results indicate that metal modification has no influence on phase composition of Fe and surface electronic state of Fe species. However, the modification reduces surface area of catalyst and dispersion of active phase, weakens adsorption ability of H₂ and lowers H₂ desorption activation energy of the catalyst. Zn and Zr doping restrain reduction of catalysts, while Mn and Sr doping promotes reduction of catalysts. The doping of Mn, Zn and Zr inhibits adsorption of CO on the catalyst surface, while Sr promotes dissociation and adsorption of CO. Mn, Zn, Zr and Sr promote C-C coupling and hydrogenation reaction. Among them, Mn and Zr are more prominent.
- modified silica,
- modifier,
- iron-based catalyst,
- H₂ adsorption,
- kinetic analysis
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Effects of modified SiO2 on H2 and CO adsorption and hydrogenation of iron-based catalysts

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Effects of modified SiO₂ on H₂ and CO adsorption and hydrogenation of iron-based catalysts