Abstract
Volatile organic compounds (VOCs) are toxic and are considered the most important sources for the formation of photochemical smog, secondary organic aerosols (SOAs), and ozone. These can also greatly affect the environment and human health. For this reason, VOCs are removed by applying various technologies or reused after recovery. Catalytic oxidation for VOCs removal is widely applied in the industry and is regarded as an efficient and economical method compared to other VOCs removal technologies. Currently, a large amount of VOCs are generated in industries with solvent-based processes, and the ratio of aromatic compounds is high. This paper covers recent catalytic developments in VOC combustion over noble-metal-based catalysts. In addition, this report introduces recent trends in the development of the catalytic mechanisms of VOC combustion and the deactivation of catalysts, such as coke formation, poisoning, sintering, and catalyst regeneration. Since VOC oxidation by noble metal catalysts depends on the support of and mixing catalysts, an appropriate catalyst should be used according to reaction characteristics. Moreover, noble metal catalysts are used together with non-noble metals and play a role in the activity of other catalysts. Therefore, further elucidation of their function and catalytic mechanism in VOC removal is required.
Highlights
Volatile organic compounds (VOCs) are liquid or gaseous organic compounds that evaporate into the atmosphere due to their low boiling point
Catalytic oxidation is used as an effective method to treat VOCs emitted by various industrial sites
Noble metal catalysts are one of the most effective materials because they can be applied to VOC combustion at lower temperatures compared to other materials
Summary
Volatile organic compounds (VOCs) are liquid or gaseous organic compounds that evaporate into the atmosphere due to their low boiling point. VOCs emissions from various sources typically include BTEX (benzene, ethylbenzene, toluene, xylene), alcohols, esters, and organic solvents. Examples of methods using chemical conversion include oxidation using fuel or decomposition using UV or microorganisms This method has a disadvantage in that VOCs cannot be recovered; this is a major drawback especially when the target VOCs are expensive. Examples of separation and recovery technologies include adsorption and film separation, as well as condensation using cooling In this case, VOCs are mixed with different components, and this method has a disadvantage in that the total removal rate is reduced based on the selective adsorption capacity of adsorbents [8,9,10]. Noble-metal-based catalysts are widely used owing to their effectiveness for low-temperature VOC oxidation and high BTEX oxidation efficiency. The characteristics of noble-metal-based combustion catalyst technology are investigated
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