期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 146, 期 -, 页码 1-11出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.02.033
关键词
DPF regeneration; Soot; Ceria; Doped-ceria; Diesel engine contamination
资金
- Generalitat Valenciana (Project Prometeo) [2009/047]
- Spanish Ministry of Economy and Competitiveness [CTQ2012-30703]
- FEDER resources
Different aspects of the ceria-catalyzed Diesel soot combustion reactions have been critically discussed, such as the high catalytic activity of ceria for Diesel soot combustion in comparison to some other potential catalysts, the potential ceria-catalyzed Diesel soot combustion mechanisms (the so-called NO2-assisted mechanism and the active oxygen mechanism) and the effect of ceria doping with suitable cations like those of Pr, La or Zr. Ceria must be doped in order to enhance thermal stability, but ceria doping also changes different physicochemical and catalytic properties of ceria. Zr-doping, for instance, has a double role on ceria as soot combustion catalyst: enhances ceria oxidation capacity of the adsorbed NO species (Positive effect) but stabilizes NO2 on surface (negative effect). The surface properties of a ceria catalyst are usually more important than those of bulk: high surface area/small crystal size usually has a positive effect on the catalyst performance and, in mixed oxides, the surface composition also plays a role. The optimal dopant loading depends on the foreign cation being, for instance, around 5-10%, 20-30% and 50 mol% for La3+, Zr4+, and Pr3+/4+, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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