Progress of Zeolite Molecular Sieve for VOCs Adsorption
TANG Qianxi1, CHEN Donghang1, ZHANG Chunjie2, WANG Gang2, GUO Limin1
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
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.
作者简介: 汤倩茜,2019年6月毕业于华中科技大学,获得工学学士学位。现为华中科技大学环境科学与工程学院硕士研究生,在郭利民教授的指导下进行研究。目前主要研究领域为沸石分子筛吸附VOCs。 郭利民,男,华中科技大学环境科学与工程学院教授,中欧清洁与可再生能源学院兼职教授。2005年中南大学金属材料工程专业本科毕业,2010年中国科学院上海硅酸盐所材料物理与化学专业博士毕业。2010年至2012年日本东北大学日本学术振兴会外国人特别研究员,2012年至2016年日本九州大学碳中和能源国际研究所从事博士后研究工作。其后,在华中科技大学环境科学与工程学院工作至今。主要从事吸附/催化剂制备、VOCs吸附/催化燃烧消除、CO2催化加氢等的应用基础研究;近年来承担国家自然科学基金、国家重点研发计划、日本学术振兴会、湖北省杰出青年人才项目、国家/省重点实验室开放基金、日本九州大学、企业横向课题等项目20余项;在国内外学术期刊发表论文80余篇,申请中国发明专利19项,其中授权专利11项,专利转让2项。目前担任中国材料研究学会环境材料分委会委员、中国环境科学学会挥发性有机物污染防治专委会常委、湖北省环境科学学会青年工作委员会副主任委员、《能源环境保护》编委及Chinese Chemical Letters青年编委。
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