Direct production of olefins via syngas conversion over Co2C-based catalyst in slurry bed reactor

Xinxing Wang; Tiejun Lin; Jie Li; Fei Yu; Dong Lv; Xingzhen Qi; Hui Wang; Liangshu Zhong; Yuhan Sun

doi:10.1039/c8ra10477h

Direct production of olefins via syngas conversion over Co₂C-based catalyst in slurry bed reactor

RSC Adv. 2019 Jan 30;9(8):4131-4139. doi: 10.1039/c8ra10477h.

Authors

Xinxing Wang^{1

2}, Tiejun Lin¹, Jie Li¹, Fei Yu^{1

2}, Dong Lv¹, Xingzhen Qi¹, Hui Wang¹, Liangshu Zhong^{1

3}, Yuhan Sun^{1

3}

Affiliations

¹ CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences Shanghai 201203 P. R. China zhongls@sari.ac.cn.
² University of the Chinese Academy of Sciences Beijing 100049 P. R. China.
³ School of Physical Science and Technology, ShanghaiTech University Shanghai 201203 P. R. China.

Abstract

Direct production of olefins via syngas conversion over a Co₂C-based catalyst was investigated in a slurry bed reactor (SBR). It was found that the total selectivities to olefins and oxygenates reached 88.8C% at a CO conversion of 29.5% at 250 °C, 5 bar and H₂/CO = 0.5. The hydrocarbon distribution greatly deviated from the classical Anderson-Schulz-Flory (ASF) distribution, with only 2.6C% methane selectivity was obtained. XRD and TEM characterization verified that the Co₂C nanoprisms with special exposed facts of (101) and (020) constitutes the Fischer-Tropsch to olefins (FTO) active site. The catalytic activity increased gradually with rising the reaction temperature, while the product distribution almost kept unchanged under various reaction condition in SBR. Compared to the reaction in FBR, the Co₂C-based catalyst exhibited relative better catalytic performance during FTO process in SBR. Specifically, a higher CO conversion, a lower methane selectivity and a higher total selectivities to olefins and oxygenates were achieved in SBR. In addition, the catalyst can be in situ reduced in slurry bed reactor at mild temperature (300 °C) and no obvious deactivation was found within nearly 100 h time-on-stream, which suggested a promising route for the direct production of olefins via syngas in industrial application.