Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (9): 1348-1359.DOI: 10.1016/S1872-2067(20)63605-1

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Copper-ceria solid solution with improved catalytic activity for hydrogenation of CO2 to CH3OH

Bin Yanga, Wei Denga, Limin Guoa, Tatsumi Ishiharab,c   

  1. a School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    b International Institute for Carbon-Neutral Energy Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan;
    c Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
  • Received:2020-01-15 Revised:2020-02-26 Online:2020-09-18 Published:2020-08-08
  • Supported by:
    The work was financially supported by National Natural Science Foundation of China (21878116), Natural Science Foundation of Hubei Province (2019CFA070), National Key R&D program of China (2017YFE0127400) and Program for Huazhong University of Science and Technology (HUST) Academic Frontier Youth Team (2018QYTD03).

Abstract: A copper-ceria solid solution and ceria-supported copper catalysts were prepared and used for the catalytic hydrogenation of CO2 to CH3OH. According to site-specific classification and quantitative analyses (X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, and CO adsorption), the interfaces of the prepared catalysts were classified as Cu incorporated into ceria (Cu-Ov-Cex), dispersed CuO (D-CuO-CeO2), and bulk CuO (B-CuO-CeO2) over the CeO2 surface. These results, together with those of activity tests, showed that the Cu-Ov-Cex species was closely related to the CO2 hydrogenation activity and resulted in a much higher turnover frequency of CH3OH production than that observed with the D-CuO-CeO2 and B-CuO-CeO2 species. Thus, the copper-ceria solid solution exhibited improved activity due to the higher Cu-Ov-Cex fraction.

Key words: Copper-ceria, Solid solution, CO2 hydrogenation, Methanol, Active site