Citation: Zhibiao Shi, Haiyan Yang, Peng Gao, Xinqing Chen, Hongjiang Liu, Liangshu Zhong, Hui Wang, Wei Wei, Yuhan Sun. Effect of alkali metals on the performance of CoCu/TiO₂ catalysts for CO₂ hydrogenation to long-chain hydrocarbons[J]. Chinese Journal of Catalysis, ;2018, 39(8): 1294-1302. doi: 10.1016/S1872-2067(18)63086-4 shu

Effect of alkali metals on the performance of CoCu/TiO₂ catalysts for CO₂ hydrogenation to long-chain hydrocarbons

Zhibiao Shi ^a,b, ,
Haiyan Yang ^b ,
Peng Gao ^b ,
Xinqing Chen ^b ,
Hongjiang Liu ^a ,
Liangshu Zhong ^b,c ,
Hui Wang ^b ,
Wei Wei ^b,c ,
Yuhan Sun ^b,c

a Department of chemistry, College of Sciences, Shanghai University, Shanghai 200444, China;
b CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;
c School of physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Received Date: 18 March 2018
Revised Date: 23 April 2018

Fund Project: This work was supported by the "Frontier Science" Program of Shell Global Solutions International B. V. (PT65197), the National Natural Science Foundation of China (21773286, 21503260, 21776296), Youth Innovation Promotion Association CAS (20178330), the "Transformational Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21090204), and Shanghai Municipal Science and Technology Commission, China (16DZ1206900).

CoCu/TiO₂ catalysts promoted using alkali metals (Li, Na, K, Rb, and Cs) were prepared by the homogeneous deposition-precipitation method followed by the incipient wetness impregnation method. The influences of the alkali metals on the physicochemical properties of the CoCu/TiO₂ catalysts and the catalytic performance for CO₂ hydrogenation to long-chain hydrocarbons (C₅₊) were investigated in this work. According to the characterization of the catalysts based on X-ray photoelectron spectroscopy, X-ray diffraction, CO₂ temperature-programmed desorption (TPD), and H₂-TPD, the introduction of alkali metals could increase the CO₂ adsorption and decrease the H₂ chemisorption, which could suppress the formation of CH₄, enhance the production of C₅₊, and decrease the hydrogenation activity. Among all the promoters, the Na-modified CoCu/TiO₂ catalyst provided the maximum C₅₊ yield of 5.4%, with a CO₂ conversion of 18.4% and C₅₊ selectivity of 42.1%, because it showed the strongest basicity and a slight decrease in the amount of H₂ desorption; it also exhibited excellent catalytic stability of more than 200 h.
- Carbon dioxide hydrogenation,
- Long-chain hydrocarbons,
- Carbon dioxide Fischer-Tropsch synthesis,
- Alkali metal promoters,
- Cobalt-copper based catalysts
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Effect of alkali metals on the performance of CoCu/TiO₂ catalysts for CO₂ hydrogenation to long-chain hydrocarbons