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The catalytic removal of NOx under lean condi- tions is one of the most important targets in catalysis re- search. The activities of metal oxides, zeolite-based catalysts and noble metal catalysts together with the factors are influ- encing the selective reduction of NOx with hydrocarbons are reviewed. The reaction mechanisms for the three types of catalysts are briefly discussed. Recent progress in combined catalyst and NOx storage reduction catalysts is also intro- duced. Finally, future research directions are forecasted.
The activities of metal oxides, zeolite-based catalysts and noble metal catalysts together with the factors are influ- encing the selective reduction of NOx with the progress of the three types of catalysts are discussed. Recent progress in combined catalyst and NOx storage reduction catalysts is also intro- duced. Finally, future research directions are forecasted.