高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (7): 20220187.doi: 10.7503/cjcu20220187

• 研究论文 • 上一篇    下一篇

CO2加氢制低碳醇CuFe基催化剂中的Mn助剂效应

张昕昕1, 许狄1, 王艳秋1, 洪昕林1, 刘国亮1(), 杨恒权2()   

  1. 1.武汉大学化学与分子科学学院, 武汉 430072
    2.山西大学化学化工学院, 太原 237016
  • 收稿日期:2022-03-24 出版日期:2022-07-10 发布日期:2022-04-26
  • 通讯作者: 刘国亮 E-mail:liugl@whu.edu.cn;hqyang@sxu.edu.cn
  • 作者简介:杨恒权, 男, 博士, 教授, 主要从事绿色催化研究. E-mail: hqyang@sxu.edu.cn
  • 基金资助:
    湖北省自然科学基金(2021CFB358);山西省重大科技项目(20201102005)

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)

摘要:

采用共沉淀法制备了一系列Mn掺杂的CuFeZnK催化剂, 研究了Mn助剂对催化剂的结构及催化CO2加氢制低碳醇合成性能的影响. 结果表明, 引入适量的Mn(质量分数2.1%)能有效提高低碳醇的选择性和时空收 率(STY), 在320 ℃和5 MPa的条件下, CO2的转化率为29.4%, 低碳醇选择性(CO-free)达到23.2%, 时空收率达到41.1 mg·gcat-1·h?1, 且低碳醇在总醇中的比例达到96.9%. 利用X射线衍射(XRD)、 N2吸附-脱附实验、 X射线光电子能谱(XPS)、 透射电子显微镜(TEM)和氢气程序升温还原(H2-TPR)等手段对制得催化剂进行表征, 结果表明, 适量Mn可以起到结构助剂的作用, 减小Cu颗粒尺寸的同时促进Fe5C2相的形成, 从而构建丰富的Cu-Fe5C2活性界面, 用于低碳醇合成. 而过量的Mn反而会堵塞催化剂的孔道, 覆盖活性位点, 降低了催化性能.

关键词: 二氧化碳加氢, 低碳醇合成, 铜铁基催化剂, 锰助剂

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

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