Recent advances in the selective catalytic reduction of NOx by NH3 over small-pore zeolite catalysts

Selective catalytic reduction of NOx by NH3 (NH3-SCR) is one of the most effective methods for the removal of NOx. Small-pore zeolite catalysts, such as Cu/SSZ-13 and Cu/SAPO-34, have attracted more and more attention for the NH3-SCR of NOx due to the high activity and hydrothermal stability. The recent advances of NH3-SCR of NOx over small-pore zeolite catalysts (especially Cu-based zeolite) are reviewed. Special attention is laid on the catalytic performance, influence factors and the NH3-SCR reaction mechanism. Finally, future research on the small-pore zeolite catalysts for NH3-SCR of NOx is proposed.