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Diesel soot combustion ceria catalysts ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
45177 46405 2014 11 PDF Available
Title
Diesel soot combustion ceria catalysts ☆
Abstract

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 NOx 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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► This review article summarizes the keynote lecture presented at ICEC 2012. ► The potential ceria-catalyzed Diesel soot combustion mechanisms are discussed. ► The effect of ceria doping with suitable cations (Pr, La or Zr) is discussed.

Keywords
DPF regeneration; Soot; Ceria; Doped-ceria; Diesel engine contamination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 146, March 2014, Pages 1–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
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