Applied Catalysis B-environmental | 2021
To enhance water resistance for catalytic ozone decomposition by fabricating H2O adsorption-site in OMS-2 tunnels
Abstract
Abstract OMS-2-based catalysts hold the promise of practical applications in ozone decomposition for their excellent activity, yet improvement of water resistance property remains challenging. Here, we reported an innovative Li-K-OMS-2 catalyst which possessed specific non-oxygen vacancy sites for H2O adsorption in the tunnel framework. This catalyst showed the decrease of only ∼10% of ozone conversion after reaction for 6\u2009h under the RH of 90%, the initial ozone concentration of 45\u2009ppm and GHSV of 660,000h−1 at 25\u2009°C, which was superior to the currently documented MnO2-based catalysts. Both physiochemical characterization and DFT calculations revealed that the excellent water resistance property of Li-K-OMS-2 could be attributed to the formation of designed novel non-oxygen vacancy sites for H2O adsorption, which effectively alleviated the catalyst deactivation caused by non-dissociative adsorption of H2O on oxygen vacancies. The findings represented a critical step towards the rational design and synthesis of high water-resistant catalyst for ozone decomposition.