Cu/SSZ-13 and Cu/SAPO-34 catalysts for deNOx in diesel exhaust: Current status, challenges, and future perspectives

[Display omitted] •The NH3-SCR mechanisms (standard SCR and fast SCR) are elaborately reviewed.•The sulfur/alkali metal/phosphorus poisoning mechanisms are comprehensive reviewed.•The hydrothermal deactivation mechanisms of Cu/CHA are comprehensive reviewed.•The poisoning-resistant and protective strategies of Cu/CHA are proposed.•Ultrafast and continuous flow synthesis of Cu/CHA zeolites are reviewed. Copper-exchanged SSZ-13 and SAPO-34 (Cu/CHA) zeolites catalysts have been commercially utilized for selective catalytic reduction (SCR) of NOx by NH3. Despite the significant advances in both fundamental research and industrial application have been made, the limited catalytic activity at low exhaust temperatures, the challenges of sulfur/alkali (alkaline) metal/phosphorus poisoning and hydrothermal deactivation have spurred the development of new generation NH3-SCR catalysts. This paper reviews the recent progress for Cu/CHA in regard to zeolite synthesis, the latest SCR reaction mechanisms, the poisoning and hydrothermal deactivation mechanisms, more importantly, corresponding poisoning-resistant and protective strategies are also proposed, some issues that still need to be addressed are also highlighted. We hope to construct a linkage between next generation of catalysts and real-world applicable demands to meet the escalating emission regulations in the near future.