Catalytic removal of toluene using MnO2-based catalysts: A review. (March 2023)

• Record Type: Journal Article
• Authors: Gong, Pijun; He, Feng; Xie, Junlin; Fang, De
• Is Part Of: Chemosphere. Volume 318(2023)
• Publication Date: 2023-03
• Subjects: VOCs -- Toluene -- MnO2 -- Catalytic oxidation -- Reaction mechanisms; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2023.137938
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Volatile organic compounds (VOCs) have serious hazard to human health and ecological environment. Due to its low cost and high activity, the catalytic oxidation technology considered to be the most effective method to remove VOCs. Toluene is one of the typical VOCs, hence its catalytic elimination is crucial for the regulation of VOCs. Manganese dioxide (MnO2 ) has been extensively studied for its excellent redox performance and low-temperature operation conditions. In this review, we summarize the research progresses in the toluene catalytic oxidation of MnO2 -based catalysts, which contain single MnO2, metal-doped MnO2 and supported MnO2 catalyst. In particular, we pay much attention on the relationship between the chemical properties and toluene oxidation performance over MnO2 catalyst, as well as the catalytic reaction mechanisms. Moreover, the effects of different crystal forms and morphologies on the catalytic toluene reaction were discussed. And the perspective on MnO2 catalysts for the catalytic oxidation of toluene has been proposed. We expect that the summary of these important findings can serve as an important reference for the catalytic treatment of VOCs. Graphical abstract: To better understand the fundamental relation between different aspects of MnO2 -based catalysts in the field of toluene catalytic oxidation, this review mainly addresses the catalyst development, key influential factors and reaction mechanism of toluene decomposition in the catalysis process. Also, a comparison of the performance in various MnO2 -based catalysts is provided, including single MnO2, metal-doped MnO2 and supported MnO2 catalyst. Particular emphasis is given to the importance of the catalyst poisoning and by-product detection in the toluene removal, which can be used as a reference point for future studies in this field. Image 1 Highlights: Systematically reviews the emerging advances of catalytic toluene on MnO2 . The influence of various factors (crystal and morphology) were fully discussed. Exploring the reaction path and mechanism via in-situ techniques. Future perspectives on catalytic toluene was proposed.