Research Progress in the Selective Catalytic Reduction of NOx by H2 in the Presence of O2

As one environmentally benign technology for the removal of NOx, the selective catalytic reduction of NOx by hydrogen (H-2-SCR) in the presence of oxygen has attracted more and more attention. Recent progress in the H-2-SCR of NOx has been reviewed with the focus on H-2-SCR catalysts and the reaction mechanisms. The effects of the reaction conditions (H-2, O-2, H2O, CO and SO2) on the performance of H-2-SCR catalysts have been discussed. Finally, the future research direction for the H-2-SCR of NOx has been proposed.