Highly Water-Resistant\nCe-Doped CuMnO<sub><i>x</i></sub> Catalyst for Durable CO\nOxidation by Inhibiting\nByproducts

Air pollution is a serious challenge in the rapid development\nof\nthe iron and steel industries. The development of water resistance\nin the CO catalyst is the key prospect in sintering flue gas terminal\ntreatment. In the work described in this paper, we introduced Ce into\nCuMnO<sub><i>x</i></sub> to regulate its water resistance,\nand a model was proposed to explore the mechanism of carbonate product\nelimination. A 7.5% Ce-doped sample showed the best activity, increasing\nthe reaction rate by 8 times, with the CO conversion rate over 90%\nat 110 °C and over 80% after 100 h in a humid environment. The\nsample characterization analysis showed that Ce intercalation breaks\nthe surface charge balance and promotes electronic migration and the\nbinding of external protons. Proper Ce-doping to enhance the surface\nLewis and Bronsted acidity could inhibit the adsorption and solidification\nof acidic gas CO<sub>2</sub> on catalysts. Meanwhile, a Ce–Mn\ncharge-transfer interaction passivates the overly compact binding\nof Mn sites to carbonate intermediates, making the adsorption and\ndesorption of hydration products reach a good balance and inhibiting\nthe formation of carbonate complexes. This study provides insights\nfor the mechanisms of water resistance to strengthen the application\nof CuMnO<sub><i>x</i></sub> catalysts in humid environments.