| Abstract Lean��burn technology can not only improve fuel economic efficiency but also reduce CO2 emission. However, in lean��burn exhaust, there exists excess oxygen, which accelerates the catalytic oxidation of reductants, and therefore decreasing efficiency of NOx reduction over the conventional three��way catalysts. At present, there are mainly three kinds of catalytic technology for lean��burn NOx removal, namely NO direct decomposition, selective catalytic reduction (SCR) and NOx storage and reduction (NSR). In this paper, the lean��burn combustion technique is briefly introduced, and the catalytic technology for lean��burn NOx removal is systematically reviewed. |
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2011, Vol. 28 
