Study on preparation and denitrification performance of NH₃-SCR of bimetallic Cu-Ce/SAPO-34 catalyst

A series of Cu-Ce/SAPO-34 bimetallic zeolite catalysts were prepared by impregnation method. The performance of the different quality Cu/Ce ratios zeolite catalysts for selective catalytic reduction of NO was investigated in a catalyst evaluation device. XRD, SEM, NH₃-TPD, XPS, and in-situ DRIFTS were used to characterize and analyze the catalysts. The results show that the modified Cu-Ce/SAPO-34 catalyst has good denitration performance and wide activity temperature window. When the content of Cu and Ce is 4%, the zeolite catalyst has the best denitration efficiency; the denitration efficiency is 80% at 325−500 ℃, and the NO conversion rate is more than 99% at 400−500 ℃. The bimetallic oxide species are highly dispersed on the surface of the catalyst, the crystal structure of SAPO-34 is not affected, and the interaction between the active substance and the support is good. 4Cu-4Ce/SAPO-34 has an appropriate amount of acidic sites, and this mixture has positive effects on the denitrification performance and stability of the catalyst. It follows the E-R mechanism in the NH₃-SCR reaction process.