Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (12): 2053-2058.DOI: 10.1016/S1872-2067(16)62538-X

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Selective reduction of carbon dioxide to carbon monoxide over Au/CeO2 catalyst and identification of reaction intermediate

Xiaobing Zhu, Xin Qu, Xiaosong Li, Jinglin Liu, Jianhao Liu, Bin Zhu, Chuan Shi   

  1. Center for Hydrogen Energy and Liquid Fuels;Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2016-08-23 Revised:2016-09-29 Online:2016-12-27 Published:2016-12-27
  • Contact: Chuan Shi
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (11475041, 11175036, 21373037), and the Fundamental Research Funds for the Central Universities (DUT16QY49).

Abstract:

CO2 selective reduction to CO with H2 over a CeO2-supported nano-Au catalyst at atmospheric pressure was investigated. A high CO2 conversion, approaching the thermodynamic equilibrium value, and nearly 100% CO selectivity were obtained. The surface formate intermediates generated during the reverse water-gas shift reaction at 400℃ were identified using in situ diffuse-reflectance infrared Fourier-transform spectroscopy. The formate consumption to give CO and H2O, determined using mass spectrometry, indicated that the reaction proceeded via an associative formate mechanism; this contributes to the high Au/CeO2 catalytic activity at low temperatures.

Key words: CO2 reduction, Au/CeO2 catalyst, Carbon monoxide, Formate intermediate, In situ DRIFT spectroscopy