Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (7): 20220187.doi: 10.7503/cjcu20220187

• Article • Previous Articles     Next Articles

Effect of Mn Promoter on CuFe-based Catalysts for CO2 Hydrogenation to Higher Alcohols

ZHANG Xinxin1, XU Di1, WANG Yanqiu1, HONG Xinlin1, LIU Guoliang1(), YANG Hengquan2()   

  1. 1.College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China
    2.School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 237016,China
  • Received:2022-03-24 Online:2022-07-10 Published:2022-04-26
  • Contact: LIU Guoliang E-mail:liugl@whu.edu.cn;hqyang@sxu.edu.cn
  • Supported by:
    the Natural Foundation of Hubei Province, China(2021CFB358);the Major Science and Technology Projects in Shanxi Province, China(20201102005)

Abstract:

A series of Mn promoted CuFe based catalysts with different Mn contents was synthesized with the co-precipitation method. The promoting effect of Mn on CuFe based catalyst in CO2 hydrogenation to higher alcohol(HA) was studied. The catalytic results show the HA selectivity and space time yield(STY) could be effectively improved by introducing moderate Mn. The optimized catalyst denoted as 2.1MCFZ-K with 2.1%(mass fraction) Mn content exhibits the best catalytic performance with CO2 conversion of 29.4%, HA selectivity(CO-free) of 23.2%, HA space time yield of 41.1 mg·gcat-1·h?1, and C2+OH/ROH fraction of 96.9% at 320 ℃ and 5 MPa. X-ray diffraction(XRD), N2 sorption experiments, X-ray photoelectron spectroscopy(XPS), transmission electron microscopy(TEM) and H2 temperature-programmed reduction(H2-TPR) experiments reveal that Mn as a structural promoter with moderate content can reduce the particle size of Cu and promote the formation of Fe5C2 active phase, thus fabricating rich Cu-Fe5C2 active interface for HA synthesis. Overly high Mn content can block active sites, inhibiting the catalytic activity.

Key words: CO2 Hydrogenation, Higher alcohol synthesis, CuFe-based catalyst, Mn Promoter

CLC Number: 

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