文献类型：期刊文献

英文题名：Generation of Abundant Oxygen Vacancies in Sandwich Structured Ε-MnO2/γ-Al2O3/Al by a Facile Modification Strategy for Enhanced Catalytic Decomposition of Ozone in Humid Condition

作者：Xie, Zukun[1]; Ji, Lei[1]; Bian, Haoran[1]; Zhang, Qi[1,2,3]

机构：[1] Department of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240489459)

语种：英文

外文关键词：Air cleaners - Air conditioning ducts - Pyrolysis - Redox reactions

摘要：Ozone is a ubiquitous environmental pollutant and Mn-based catalysts have been widely studied for ozone decomposition. However, the poor moisture resistance and granular structure make them difficult to be applied in purifiers. In this study, a novel sandwich structured mesh Ti-modified Mn/γ-Al2O3/Al catalyst was developed. The optimized MnTi2.2/γ-Al2O3/Al catalyst obtained stable ozone removal of 94% within 6 h under RH=70% (O3: 40±2 ppm, T: 25 ℃, WHSV: 150,000 mL/(gcat·h)). Detailed characterizations showed that the abundant oxygen vacancies and redox pairs on the catalyst surface facilitated ozone decomposition. DFT calculations indicated that Ti modification reduced the formation energy of oxygen vacancies, inhibited the adsorption of H2O, and promoted the desorption of O2. In addition, the module composed of 6 pieces of MnTi2.2/γ-Al2O3/Al catalysts was successfully applied to the air duct. The module not only showed 75% ozone removal after a 24-h test (O3: 400±30 ppb, T: 25±2 ℃), but also its pressure drop was only 15.5 Pa under the face velocity of 1 m/s. Finally, the accelerated aging tests under laboratory and simulated real conditions proved the excellent catalyst service life. This work provides a novel and advanced strategy for improving the moisture resistance of catalysts to develop superior monolithic catalytic filters. ? 2024, The Authors. All rights reserved.