Direct synthesis of higher oxygenates via syngas over zinc oxide modified CoMn-based catalysts
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作者
Qi, Xingzhen; Lin, Tiejun; Gong, Kun; Wang, Xinxing; Lv, Dong; Yu, Fei; An, Yunlei; Tang, Zhiyong; Zhong, Liangshu
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刊物名称
APPLIED CATALYSIS A-GENERAL
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年、卷、文献号
2022, 648, 0926-860X
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关键词
Qi, Xingzhen; Lin, Tiejun; Gong, Kun; Wang, Xinxing; Lv, Dong; Yu, Fei; An, Yunlei; Tang, Zhiyong; Zhong, Liangshu
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摘要
Controlling product selectivity still remains as a grand challenge for syngas conversion to fuels and chemicals. Herein, ZnO modified CoMn-based catalysts were prepared for direct higher oxygenates synthesis via syngas conversion, and the role of Zn promoter on catalytic behaviour and structure evolution was investigated comprehensively. It was found that the addition of Zn greatly reduced the particle size of active phases including Co and Co2C. Specially, the Zn promoter facilitated the formation of Co2C species, thus effectively tuning the surface ratio of Co/Co2C and strengthening the function for CO associative adsorption and insertion for oxy-genates product formation. As a result, the oxygenates selectivity was enhanced to 39.1 wt% over ZnO-promoted CoMn-based catalyst, where more than 96.0 wt% of the produced oxygenates are C2+ products. In addition, Zn promoter can weaken the chain growth ability, leading to the increase of low carbon chain products.
