Recent advance of CuO-CeO2 catalysts for catalytic elimination of CO and NO

Abstract

Carbon monoxide (CO) and nitric oxide (NO) are widely present in industrial flue gas such as sintering coking, and automobile exhaust gas. Their long-term presence in the atmosphere will endanger human health and the ecological environment. CO catalytic oxidation is a widely used CO removal technology, and catalytic reduction of NO by CO is considered to be one of the feasible technologies for collaborative removal of CO and NO in the flue gas containing both NO and CO, such as sintering and coking flue gas. Compared with expensive precious metal catalysts, transition metal composite oxides CuO-CeO₂ catalysts show good catalytic activity and stability in both CO catalytic oxidation and NO catalytic reduction by CO applications. Therefore, this article focuses on summarizing the reaction mechanism of CuO-CeO₂ catalysts in CO catalytic oxidation and NO catalytic reduction by CO and the key influencing factors of activity, such as Cu:Ce ratio, synthetic methods, calcination temperature, CeO₂ shape, O₂ content, etc., the influence of the above factors on the surface active sites of CuO-CeO₂ catalyst, surface oxygen vacancies, the interaction between Cu and Ce redox pairs, and the specific surface area of the catalyst are briefly described. The future research work is prospected to provide theoretical guidance for the optimization of CuO-CeO₂ catalyst and the promotion of its industrial application.