Efficient Ozone Elimination Over MnO2via Double Moisture-Resistance Protection of Active Carbon and CeO2

The widespread ozone (O3) pollution is extremely hazardous to human health and ecosystems. Catalytic decomposition into O2is the most promising method to eliminate ambient O3, while the fast deactivation of catalysts under humid conditions remains the primary challenge for their application. Herein, we elaborately developed a splendidly active and stable Mn-based catalyst with double hydrophobic protection of active carbon (AC) and CeO2(CeMn@AC), which possessed abundant interfacial oxygen vacancies and excellent desorption of peroxide intermediates (O22–). Under extremely humid (RH = 90%) conditions and a high space velocity of 1200 L h–1g–1, the optimized CeMn@AC achieved nearly 100% O3conversion (140 h) at 5 ppm, showing unprecedented catalytic activity and moisture resistance toward O3decomposition. In situDRIFTS and theory calculations confirmed that the exceptional moisture resistance of CeMn@AC was ascribed to the double protection effect of AC and CeO2, which cooperatively prevented the competitive adsorption of H2O molecules and their accumulation on the active sites of MnO2. AC provided a hydrophobic reaction environment, and CeO2further alleviated moisture deterioration of the MnO2particles exposed on the catalyst surface via the moisture-resistant oxygen vacancies of MnO2–CeO2crystal boundaries. This work offers a simple and efficient strategy for designing moisture-resistant materials and facilitates the practical application of the O3decomposition catalysts in various environments.