Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (2): 160-167.DOI: 10.11944/j.issn.1000-0518.2020.02.190211

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Catalytic Performance of Pd-Cu/ZrO2 Catalyst for Hydrogenation of Carbon Dioxide to Methanol

GAO Jiaa,SONG Fujiaob,CHENG Wenqiangc,GE Yanc,XU Qia*()   

  1. aSchool of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China
    bSchool of Environmental Science Engineering,Yancheng Institute of Technology,Yancheng,Jiangsu 224051,China
    cSchool of Chemistry and Chemical Engineering,Yancheng Institute of Technology,Yancheng,Jiangsu 224051,China
  • Received:2019-07-31 Accepted:2019-11-04 Online:2020-02-01 Published:2020-02-06
  • Contact: XU Qi
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21802119)

Abstract:

Cu/ZrO2 catalysts with the Cu/Zr molar ratio of 1:1, 1:2, 1:4 and 1:8 were prepared by the sol-gel method. When n(Cu):n(Zr)=1:4, a high CO2 conversion (8.0%) with methanol selectivity of 59.5% was achieved. To increase CO2 conversion and CH3OH selectivity, Pd-Cu/ZrO2 catalyst with the Cu/Zr molar ratio of 1:4 and 1 % mass fraction of Pd was synthesized by the impregnation method. The results showed that CO2 conversion and CH3OH yield over the Pd-Cu/ZrO2 catalyst were 40.0% and 80.9% higher than that over the Cu/ZrO2 catalyst at 250 ℃, 2 MPa, 12000 mL/(g·h) and V(H2):V(CO2)=3:1. Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy analysis (FT-IR), N2 adsorption-desorption (BET), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction of H2(H2-TPR) results indicated that addition of Pd improved the dispersion and surface area of the catalyst. The strong interaction between Pd and Cu species leads to the shift of Cu2p to low binding energies and decreases the catalyst reduction temperature, which exhibits high catalytic performance for hydrogenation of CO2.

Key words: sol-gel method, impregnation method, carbon dioxide hydrogenation, methanol