Journal
JOURNAL OF CATALYSIS
Volume 287, Issue -, Pages 13-29Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2011.11.006
Keywords
Three-dimensionally ordered macroporous materials; Gold; Ce1-xZrxO2; Soot combustion; Heterogeneous catalysis; Interaction
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Funding
- National Natural Science Foundation of China [20833011, 21177160, 21173270, 20803093]
- Program for New Century Excellent Talents in University of China [NCET-10-0811]
- 863 program of China [2009AA06Z313]
- CNPC [2011D-4604-0101]
- Innovation Foundation [2010D-5006-0402]
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Three-dimensionally ordered macroporous (3DOM) Ce1-xZrxO2-supported gold nanoparticle catalysts were successfully synthesized by the gas bubbling-assisted membrane reduction (GBMR) method. Au nanoparticles with similar sizes are well dispersed and supported on the inner walls of uniform macropores. The active oxygen species (O-2(-), O-) over 3DOM Au/Cel-xZrxO2 catalysts are derived from the two approaches: one is direct activation of oxygen on the surface of gold nanoparticles and the other is derived from strong metal-support interaction in which Ce-based supports serve as a reservoir for oxygen in the oxidation reaction. 3DOM Au/Ce1-xZr5O2 catalysts exhibited good catalytic performance for soot combustion, which is strongly related to the role of supports including the structures, the Ce/Zr ratios and the active oxygen supply pathways. The reaction pathways of soot combustion can be classified by two regions. At the low temperature, the soot particles are direct oxidized by active oxygen species migrated from the surface of supported Au catalysts. At the relatively high temperature, the catalytic activity for soot combustion is strongly related to intermediate reactant of NO2 derived from NO oxidation. (C) 2011 Elsevier Inc. All rights reserved.
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