Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (6): 923-933.DOI: 10.1016/S1872-2067(15)61094-4

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Effects of Au-Ce strong interactions on catalytic activity of Au/CeO2/3DOM Al2O3 catalyst for soot combustion under loose contact conditions

Baofang Jin, Yuechang Wei, Zhen Zhao, Jian Liu, Guiyuan Jiang, Aijun Duan   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China
  • Received:2016-01-24 Revised:2016-03-12 Online:2016-05-30 Published:2016-05-30
  • Contact: Yuechang Wei, Zhen Zhao
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21477146, 21303263), the National High Technology Research and Development Program of China (863 Program, 2015AA034603), Beijing Nova Program (Z141109001814072), the Specialized Research Fund for the Doctoral Program of Higher Education of China (20130007120011), and the Science Foundation of China University of Petroleum-Beijing (YJRC-2013-13, 2462013BJRC003).

Abstract:

Au/3DOM (three-dimensionally ordered macroporous) Al2O3 and Au/CeO2/3DOM Al2O3 were prepared using a reduction-deposition method and characterized using scanning electron microscopy, N2 adsorption-desorption, X-ray diffraction, transmission electron microscopy, ultraviolet-visible spectroscopy, temperature-programmed hydrogen reduction, and X-ray photoelectron spectroscopy. Au nanoparticles of similar sizes were well dispersed and supported on the inner walls of uniform macropores. The norminal Au loading is 2%. Al-Ce-O solid solution in CeO2/3DOM Al2O3 catalysts can be formed due to the incorporation of Al3+ ions into the ceria lattice, which causes the creation of extrinsic oxygen vacancies. The extrinsic oxygen vacancies improved the oxygen-transport properties. The strong metal-support interactions between Au and CeO2 increased the amount of active oxygen on the Au nanoparticle surfaces, and this promoted soot oxidation. The activities of the Au-based catalysts were higher than those of the supports (Al2O3 or CeO2/3DOM Al2O3) at low temperature. Au/CeO2/3DOM Al2O3 had the highest catalytic activity for soot combustion, with T10, T50, and T90 values of 273, 364, and 412 ℃, respectively.

Key words: Three-dimensionally ordered macroporous material, Gold nanoparticle, Ceria, Soot combustion , Synergistic effect