Support Effects in Cu-Mn mixed-oxide Catalysts on Ozone Decomposition under Ambient Temperature

Abstract

Abstract Catalytic decomposition is widely regarded as an optimal solution for surface ozone removal. However, catalyst still faces challenges such as poisoning and deactivation in the high humidity environment. Furthermore, the catalytic environment created by the mixed oxides can provide greater clarity regarding their synergistic effects on catalytic ozone decomposition. Support effects on the catalytic ozone decomposition were investigated under ambient temperature, high GHSV, and high humidity levels using the Cu-Mn mixed-oxide catalysts prepared through a simple coprecipitation method. The characterizations revealed that the addition of SiO2 improved the crystallinity of the CuMn2O4 spinel, and resulted in a larger specific surface area, abundant oxygen vacancies, a lower oxidation state of Mn, and an increase in active oxygen species. The Cu-Mn/SiO2 catalyst exhibited remarkable performance on ozone decomposition, achieving 98% ozone conversion and stability for 10 hours under ambient temperature, even when exposed to a gas hourly space velocity of 300 L·g− 1·h− 1 and an RH of 85%. This study deepens the understanding of the catalyst, and offers significant revelations into the creation of water-resistant catalysts with superior performance.