Citation: Wen-li LU, Jun-gang WANG, De-kui SUN, Zhong-yi MA, Cong-biao CHEN, Bo HOU, Bao-jun WANG, De-bao LI. CO dissociation over cobalt-based catalysts with different crystal facets[J]. Journal of Fuel Chemistry and Technology, ;2022, 50(5): 583-590. doi: 10.19906/j.cnki.JFCT.2021094 shu

CO dissociation over cobalt-based catalysts with different crystal facets

Wen-li LU ^{1, 2} ,
Jun-gang WANG ^1,, ,
De-kui SUN ¹ ,
Zhong-yi MA ¹ ,
Cong-biao CHEN ¹ ,
Bo HOU ^1,, ,
Bao-jun WANG ³ ,
De-bao LI 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 of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: Jun-gang WANG, wangjg@sxicc.ac.cn Bo HOU, houbo@sxicc.ac.cn
Received Date: 28 October 2021
Revised Date: 19 November 2021
Accepted Date: 24 November 2021
Available Online: 9 June 2022

Figures(12)

The way of CO dissociation, as a crucial step in the Fischer-Tropsch (F-T) synthesis process, has been a subject of intense debate in literature. In order to understand the F-T synthesis reaction behavior of cobalt catalysts with different crystal planes, the CO dissociation behavior over three cobalt catalysts with different crystal facets during F-T reaction was investigated by excluding the influence of support, promoter and particle size. The catalysts were characterized by temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), in-situ Raman and Chemical Transient Kinetics (CTK). The results show that CO on the Co(10-11) is activated by direct dissociation, among which small amount of carbonaceous species generated by CO dissociation forms carbon depositing on the catalyst surface under F-T reaction condition, and a large amount of carbonaceous species are hydrogenated to CH_x species. The CO on the Co(0001) crystal surface is activated predominantly by hydrogen-assisted dissociation, a large fraction of CO is dissociated into carbon deposition and a tiny fraction of CO is hydrogenated into CH_x. CO is directly dissociated on the Co(11-20) plane. The weak dissociation of CO on this catalyst results in a trace amount of carbon deposition, and a trace amount of CH_x intermediate in the presence of hydrogen.
- Fischer-Tropsch synthesis,
- cobalt-based catalyst,
- CO dissociation,
- chemical transient kinetics
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