Regulating the Cu-Ce interaction of CuCeO/SAPO-34 catalysts to achieve a wide reaction temperature window for the collaborative synergistic removal of NO and toluene at low temperatures and reaction mechanisms.

Cu-Ce metal oxides were simultaneously supported on the SAPO-34, and the interaction between the CuO and CeO metal oxides was modulated by controlling the Ce/Cu ratio. Of the series of CuCe/SAPO-34 prepared, the prepared CuCe/S-34 catalyst exhibited high activity, strong stability, and good poison resistance for the synergistic removal of NO and toluene. And the CuCe/S-34 catalyst also showed the widest collaborative reaction temperature window, with a conversion > 90 % for NO, and > 70 % for toluene at 250-350 °C. The selectivity was found to be ∼100 % for both CO and N at 225-350 °C. The CuCe/S-34 catalyst exhibited the characteristics of improved active component dispersion, appropriate redox properties, and oxygen vacancy content which are the important reasons for its excellent performance in the low-temperature synergistic removal of NO and toluene. Results from TPD experiments and in-situ DRIFTS under different reaction atmospheres for the CuCe/S-34 catalyst showed that the appropriately strong redox properties of the catalyst and its appropriate oxygen vacancy content were key to reduce the mutual influence between toluene oxidation reaction and NO reduction.