Effect of intergrowth and coexistence CuO-CeO2 catalyst by grinding method application in the catalytic reduction of NOx by CO

Heterogeneous symbiosis and coexistence CuO-CeO2 catalyst is prepared by simple grinding method to explore the symbiosis effect and the influence of different ratios of CeO2 and CuO on the catalyst structure and catalytic performance. All samples were characterized using XRD, TEM, N-2 adsorption-desorption, LRS, H-2-TPR, XPS, in situ FT-IR, the catalytic performance of the catalyst is evaluated by the CO + NO model reaction. Among them, Cu1Ce2 catalyst shows excellent catalytic performance, and testing for SO2 or/and H2O resistance. In the catalytic reaction, Cu+ in the catalyst plays an important role, and it is related to the active site where the NO molecule dissociates. Combining all the characterization results, it is shown that the introduction of CuO in the two-phase coexistence catalyst can effectively improve the oxygen vacancy content and the catalytic activity. Simultaneously, we proposed a possible mechanism for two-phase coexisting catalysts of reduction NO by CO to further understand the catalytic process. (C) 2021 Published by Elsevier B.V.

Automated summary

This study investigated the symbiosis effect of CuO-CeO2 catalyst and the influence of different ratios of CeO2 and CuO on its structure and catalytic performance. It was found that Cu1Ce2 catalyst exhibited excellent catalytic performance and resistance to SO2 and H2O. In the catalytic reaction, Cu+ played a crucial role in the catalyst and was related to the active site for NO molecule dissociation.