Citation: Baofang Jin, Yuechang Wei, Zhen Zhao, Jian Liu, Yazhao Li, Renjie Li, Aijun Duan, Guiyuan Jiang. Three-dimensionally ordered macroporous CeO₂/Al₂O₃-supported Au nanoparticle catalysts:Effects of CeO₂ nanolayers on catalytic activity in soot oxidation[J]. Chinese Journal of Catalysis, ;2017, 38(9): 1629-1641. doi: 10.1016/S1872-2067(17)62798-0 shu

Three-dimensionally ordered macroporous CeO₂/Al₂O₃-supported Au nanoparticle catalysts:Effects of CeO₂ nanolayers on catalytic activity in soot oxidation

Baofang Jin ^a, ,
Yuechang Wei ^a ,
Zhen Zhao ^a,b ,
Jian Liu ^a ,
Yazhao Li ^a ,
Renjie Li ^a ,
Aijun Duan ^a ,
Guiyuan Jiang ^a

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
b Institute of Catalysis for Energy and Environment, Shenyang Normal University, Shenyang 110034, Liaoning, China

Received Date: 29 November 2016
Revised Date: 7 January 2017

Fund Project: This work was supported by the National High Technology Research and Development Program of China (863 Program,2015AA034603),the National Natural Science Foundation of China (21477146,21673142 and 21303263),the Beijing Nova Program (Z141109001814072),the Special-ized Research Fund for the Doctoral Program of Higher Education (20130007120011),and the Science Foundation of China University of Petroleum-Beijing (YJRC-2013-13,2462013BJRC003).

A series of catalysts consisting of three-dimensionally ordered macroporous (3DOM) x-CeO₂/Al₂O₃-supported Au nanoparticles (x=2, 10, 20, and 40 wt%) were successfully synthesized using a reduction-deposition method. These catalysts were characterized using scanning electron microscopy, the Brunauer-Emmett-Teller method, X-ray diffraction, transmission electron micros-copy, ultraviolet-visible spectroscopy, and temperature-programmed reduction by H₂. Au nanopar-ticles of mean particle size 5 nm were well dispersed and supported on the inner walls of uniform macropores. The 3DOM structure improved the contact efficiency between soot and the catalyst. An Al-Ce-O solid solution was formed in the multilayer support, i.e., x-CeO₂/Al₂O₃, by the incorporation of Al³⁺ ions into the CeO₂ lattice, which resulted in the creation of extrinsic oxygen vacancies. Strong interactions between the metal (Au) and the support (Ce) increased the amount of active oxygen species, and this promoted soot oxidation. The catalytic performance in soot combustion was eval-uated using a temperature-programmed oxidation technique. The presence of CeO₂ nanolayers in the 3DOM Au/x-CeO₂/Al₂O₃ catalysts clearly improved the catalytic activities in soot oxidation. Among the prepared catalysts, 3DOM Au/20%CeO₂/Al₂O₃ showed high catalytic activity and stabil-ity in diesel soot oxidation.
- Three-dimensionally ordered macroporous material,
- Gold nanoparticle,
- Multilayer support,
- CeO₂ nanolayer,
- Soot combustion
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Three-dimensionally ordered macroporous CeO₂/Al₂O₃-supported Au nanoparticle catalysts:Effects of CeO₂ nanolayers on catalytic activity in soot oxidation