SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 38 ›› Issue (10): 106-113.DOI: 10.1016/j.cjche.2020.11.031

• Catalysis, Kinetics and Reaction Engineering • Previous Articles     Next Articles

Enhanced stability of Fe-modified CuO-ZnO-ZrO2-Al2O3/HZSM-5 bifunctional catalysts for dimethyl ether synthesis from CO2 hydrogenation

Xiao Fan1, Shoujie Ren1, Baitang Jin1, Shiguang Li2, Miao Yu3, Xinhua Liang1   

  1. 1. Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States;
    2. Gas Technology Institute, 1700 South Mount Prospect Road, Des Plaines, IL 60018, United States;
    3. Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, United States
  • Received:2020-07-08 Revised:2020-10-26 Online:2021-12-02 Published:2021-10-28
  • Contact: Xinhua Liang
  • Supported by:
    This work was supported by the U.S. Department of Energy through contract DE-AR0000806. We thank DOE ARPA-E Project Director, Dr. Grigorii Soloveichik, for his assistance and support.

Enhanced stability of Fe-modified CuO-ZnO-ZrO2-Al2O3/HZSM-5 bifunctional catalysts for dimethyl ether synthesis from CO2 hydrogenation

Xiao Fan1, Shoujie Ren1, Baitang Jin1, Shiguang Li2, Miao Yu3, Xinhua Liang1   

  1. 1. Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States;
    2. Gas Technology Institute, 1700 South Mount Prospect Road, Des Plaines, IL 60018, United States;
    3. Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, United States
  • 通讯作者: Xinhua Liang
  • 基金资助:
    This work was supported by the U.S. Department of Energy through contract DE-AR0000806. We thank DOE ARPA-E Project Director, Dr. Grigorii Soloveichik, for his assistance and support.

Abstract: A series of iron (Fe) modified CuO-ZnO-ZrO2-Al2O3 (CZZA) catalysts, with various Fe loadings, were prepared using a co-precipitation method. A bifunctional catalyst, consisting of Fe-modified CZZA and HZSM-5, was studied for dimethyl ether (DME) synthesis via CO2 hydrogenation. The effects of Fe loading, reaction temperature, reaction pressure, space velocity, and concentrations of precursor for the synthesis of the Fe-modified CZZA catalyst on the catalytic activity of DME synthesis were investigated. Long-term stability tests showed that Fe modification of the CZZA catalyst improved the catalyst stability for DME synthesis via CO2 hydrogenation. The activity loss, in terms of DME yield, was significantly reduced from 4.2% to 1.4% in a 100 h run of reaction, when the Fe loading amount was 0.5 (molar ratio of Fe to Cu). An analysis of hydrogen temperature programmed reduction revealed that the introduction of Fe improved the reducibility of the catalysts, due to assisted adsorption of H2 on iron oxide. The good stability of Fe-modified CZZA catalysts in the DME formation was most likely attributed to oxygen spillover that was introduced by the addition of iron oxide. This could have inhibited the oxidation of the Cu surface and enhanced the thermal stability of copper during long-term reactions.

Key words: CO2 hydrogenation, Cu-ZnO based catalyst, Iron (Fe), Dimethyl ether (DME), Stability

摘要: A series of iron (Fe) modified CuO-ZnO-ZrO2-Al2O3 (CZZA) catalysts, with various Fe loadings, were prepared using a co-precipitation method. A bifunctional catalyst, consisting of Fe-modified CZZA and HZSM-5, was studied for dimethyl ether (DME) synthesis via CO2 hydrogenation. The effects of Fe loading, reaction temperature, reaction pressure, space velocity, and concentrations of precursor for the synthesis of the Fe-modified CZZA catalyst on the catalytic activity of DME synthesis were investigated. Long-term stability tests showed that Fe modification of the CZZA catalyst improved the catalyst stability for DME synthesis via CO2 hydrogenation. The activity loss, in terms of DME yield, was significantly reduced from 4.2% to 1.4% in a 100 h run of reaction, when the Fe loading amount was 0.5 (molar ratio of Fe to Cu). An analysis of hydrogen temperature programmed reduction revealed that the introduction of Fe improved the reducibility of the catalysts, due to assisted adsorption of H2 on iron oxide. The good stability of Fe-modified CZZA catalysts in the DME formation was most likely attributed to oxygen spillover that was introduced by the addition of iron oxide. This could have inhibited the oxidation of the Cu surface and enhanced the thermal stability of copper during long-term reactions.

关键词: CO2 hydrogenation, Cu-ZnO based catalyst, Iron (Fe), Dimethyl ether (DME), Stability