Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (5): 750-756.DOI: 10.1016/S1872-2067(14)60294-1

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MoOx-promoted Pt catalysts for the water gas shift reaction at low temperatures

Xuejun Xua,b, Qiang Fua, Xinhe Baoa   

  1. a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-12-15 Revised:2015-01-19 Online:2015-04-17 Published:2015-04-17
  • Contact: Qiang Fu
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21222305, 21321001, 21103181), and the National Basic Research Program of China (973 Program, 2013CB834603, 2013CB933100, 2011CBA00503).

Abstract:

Pt-Mo/SiO2 catalysts were prepared using impregnation-reduction methods. Mo-promoted Pt catalysts exhibit much higher water gas shift reaction activity at low temperatures than Pt/SiO2 catalysts. Various characterization methods including inductive coupled plasma atomic emission spectrometry, X-ray diffraction, transmission electron microscopy, X-ray absorption near edge spectrum, and X-ray photoelectron spectroscopy were applied to investigate the composition, structure and chemical state of the Pt-Mo/SiO2 catalysts. Our results indicate that the added Mo species effectively improves the dispersion of Pt nanoparticles and the synergistic effect between the Pt nanoparticles and surface MoOx species enhances the catalytic performance for the water gas shift reaction. Pt nanoparticles decorated with highly dispersed MoOx patches are found to be the active architecture.

Key words: Water gas shift reaction, Platinum, Molybdenum oxide, Synergistic effect, Interface catalysis