Selective Catalytic Reduction of NOx by Hydrogen over Noble Metal Catalysts

The control of NOx is very important for the air quality improvement. Selective catalytic reduction of NOx by hydrogen (H2-SCR) has attracted much attention as an efficient and environmentally benign deNOx technology. In this review, we summarize the research development in the H2-SCR of NOx over noble metal catalysts. The typical H2-SCR reaction mechanisms are introduced first. Then the factors affecting the H2-SCR performance of noble metal catalysts, such as the active metal, support type, the added promoter and the nature of active metal, and the structure-activity relationship have been discussed. Finally, the challenges and the prospects for future development of H2-SCR catalyst are proposed.