Enhanced Performance for Selective Catalytic Reduction of NO_x with NH₃ over Nanosized Cu/SAPO-34 Catalysts

A series of nanosized Cu/SAPO-34 catalysts with different silicon contents were successfully synthesized by in situ hydrothermal method by using tetraethylammonium hydroxide and copper-tetraethylenepentamine as co-templates. The in situ prepared nanosized Cu/SAPO-34 catalysts possess strong Brønsted acidity and well-dispersed Cu species, showing enhanced performance for selective catalytic reduction of NO_x with NH₃ compared with micronsized and nanosized counterparts prepared by post impregnation method. Significantly, Cu/SAPO-34 nanocatalysts prepared by in situ method maintain the catalytic activity after the hydrothermal aging treatment, suggesting their excellent hydrothermal stability. This work will provide some guidance for the design of highly efficient catalysts for NH₃−SCR reactions.