Recent Advances of VOCs Catalytic Oxidation over Spinel Oxides: Catalyst Design and Reaction Mechanism

Abstract

Volatile organic compounds (VOCs) harm the environment and human health and have been of wide concern and purified efficiently by catalytic oxidation. Spinel oxides, mainly composed of transition metal elements with low price and extensive sources, have been widely investigated as efficient and stable catalysts for VOCs oxidation due to their adjustable element composition, flexible structure, and high thermal/chemical stability. However, it is necessary to dissect the design of the spinel in a targeted way to satisfy the removal of different types of VOCs. This article systematically summarizes the recent advances regarding the application of spinel oxides for VOCs catalytic oxidation. Specifically, the design strategies of spinel oxides were first introduced to clarify their effect on the structure and properties of the catalyst. Then the reaction mechanism and degradation pathway of different kinds of VOCs on the spinel oxides were in detail summarized, and the characteristic requirements of the spinel oxides for various VOCs purification were analyzed. Furthermore, the practice applications were also discussed. Finally, the prospects were proposed to guide the rational design of spinel-based catalysts for VOCs purification and intensify the understanding of reaction mechanisms.

High-Performance Ir1/CeO2 Single-Atom Catalyst for the Oxidation of Toluene

“…3−5 On the other hand, VOCs are severely harmful due to their teratogenic and carcinogenic properties. 6 Therefore, the elimination of VOC pollution has attracted a lot of attention. In the past decades, the methods of adsorption, 7 photocatalysis, 8 plasma, 9 biodegradation, 10 and catalytic oxidation 11 have been adopted for the removal of lowconcentration or low-recovery value VOCs.…”

“…With the development of society and modernized civilization, environmental pollution caused by mankind has become more and more prominent, especially the pollution of volatile organic compounds (VOCs). , On the one hand, the emission of VOCs has already exceeded the carrying capacity of the environment, which comes from a variety of industries, such as synthetic resin manufacturing, dyeing, printing, petroleum refining, and coating. − On the other hand, VOCs are severely harmful due to their teratogenic and carcinogenic properties . Therefore, the elimination of VOC pollution has attracted a lot of attention.…”

Weakening Mn–O Bond Strength in Mn-Based Perovskite Catalysts to Enhance Propane Catalytic Combustion

“…Air pollution is one of the most concerned problems in today’s society, and volatile organic compounds (VOCs) account for a large proportion of air pollutants. − The VOC emissions not only seriously damage the ecological environment but also seriously endanger the human health. − To this end, many countries around the world have introduced stringent environmental laws and regulations to strictly control VOC emissions. Therefore, it is of great value and significance to develop efficient VOC emission control methods and technology.…”

Redox-induced controllable engineering of MnO2-MnxCo3-xO4 interface to boost catalytic oxidation of ethane

“…It is noticed that the electrons on CeSnO x support were more easily transferred to AgO NPs, which accelerates the oxidation activity of AgO and the reduction performance of CeSnO x support, thus achieving a good match between NH 3 oxidation and NO x reduction. Also, the strong interaction between different metal oxides affects the dispersion and crystallinity of active centers 28 , 29 . Furthermore, the electronic property at interfacial region could be flexibly altered by tuning the interaction between different components 30 .…”