期刊
JOURNAL OF CATALYSIS
卷 317, 期 -, 页码 62-74出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.05.014
关键词
Three-dimensionally ordered macroporous materials; Gold; Platinum; Synergistic effect; Soot oxidation; Heterogeneous catalysis
资金
- National Natural Science Foundation of China [21177160, 21303263, 21173270]
- Beijing Nova Program [Z141109001814072]
- Science Foundation of China University of Petroleum, Beijing [2462013YJRC13, 2462013BJRC003, QZDX-2011-02]
- [20130007120011]
Supported Au@Pt core-shell nanoparticles (NPs) were successfully synthesized on three-dimensionally ordered macroporous (3DOM) oxides by a one-step gas bubbling-assisted membrane reduction (GBMR) method. The Au@Pt core-shell NPs were highly dispersed on the pore wall of oxides and the Pt shell was obtained by direct epitaxial overgrowth on the surface of the Au core. The multifunctional nanocatalysts were used for diesel soot oxidation. 3DOM structure facilitates the contact between soot particles and catalysts, and the synergetic effect of the Au core and Pt shell significantly increases the surface concentration of active O-2(-) species. 3DOM Ce0.8Zr0.2O2-supported Au@Pt core-shell NP catalyst is one of the best catalysts reported so far for soot oxidation under loose contact between soot and catalyst. The stability of the Au-based catalysts for soot oxidation is also improved due to the formation of an Au@Pt core-shell structure. (C) 2014 Elsevier Inc. All rights reserved.
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