Materials Reports 2022, Vol. 36 Issue (Z1): 21050144-9 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Progress of Zeolite Molecular Sieve for VOCs Adsorption |
TANG Qianxi1, CHEN Donghang1, ZHANG Chunjie2, WANG Gang2, GUO Limin1
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1 School of Environmental Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China 2 Shanxi Xin Hua Chemical Defense Equipment Institute Co., Ltd., Taiyuan 030008, China |
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Abstract Volatile organic compounds (VOCs) are one of the most important precursors to ozone and particulate matter (PM) generation and threa-ten the ecological environment and human health. Among many VOCs end-of-pipe treatment, adsorption stands out, aiming at low VOCs concentration in ample airflow due to low cost and simple operation. Adsorbents are the crucial factor in adsorption. As conventional adsorbents, zeolite molecular sieves possess high specific surface area, adjustable pore structure and size, tunable hydrophobicity, good hydrothermal stability and incombustibility. This review offers a retrospection of the research efforts concerning the influence of zeolite structure on the VOCs adsorption performance, classical adsorption theory models applied in VOCs adsorption, and monolithic molecular sieve adsorbents for industrial applications. Selecting zeolite molecular sieves with suitable topology and cation type makes it possible to achieve selective adsorption of specific VOCs. Meanwhile, the hydrophobicity of zeolite molecular sieves can be improved by raising the atomic ratio of silicon to aluminum, surface modification, heteroatom doping, and synthesis of zeolite molecular sieve-based composites to improve the resistance to water vapor in the humid environment. However, VOCs mass transfer can be hindered in the conventional microporous zeolites due to the small apertures of micropores (<2 nm) similar to the molecular sizes of VOCs, leading to poor adsorption performance. Either by constructing hierarchical zeolites or decreasing crystal sizes to the nanoscale, it is possible to reduce the mass transfer resistance and increase adsorption capacity. Another problem arises as the lab samples do not match with the industrial application sizes. Monolithic zeolite molecular sieve adsorbents are formed by extruding or coating to enhance their suitability for practical applications. Moreover, classical adsorption models are applied to lab data to explain the diffusion and kinetics issues from a theoretical perspective. With the improvement in VOCs adsorption performance of zeolite molecular sieves and deepening understanding of adsorption mec-hanisms and kinetics, the application of zeolite molecular sieve adsorbents in the field of VOCs purification has been expanding. The zeolite rotor is an important practice for the practical application of monolithic zeolite molecular sieves in recent years and is often followed by a combustion technique, which dramatically reduces VOCs pollution and has been widely applied in industrial VOC exhaust.
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Published: 05 June 2022
Online: 2022-06-08
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Fund:Natural Science Foundation of Hubei Province (2019CFA070). |
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