ZSM-5分子筛对典型涂装VOCs的吸附性能及机理研究OA北大核心CSTPCD
Adsorption performance and mechanism of ZSM-5 molecular sieves on typical coating VOCs
通过水热法成功合成了一系列宽硅铝比(50、100、150、300、500、800、1500、3000)的ZSM-5分子筛,旨在研究其对涂装行业典型挥发性有机物(volatile organic compounds,VOCs)的吸附规律.同时,结合分子筛表面的酸性位点,以解析硅铝比对分子筛吸附性能的影响机制.实验结果表明,丙酮的吸附能力主要受自身极性、支链结构和分子筛表面酸位点的影响.而乙酸丁酯、苯乙烯、对二甲苯、苯、甲苯的吸附性能会同时受到自身的分子量、分子直径、极性、分子结构和官能团的影响,分子量和分子直径大、极性强且具有支链结构的VOCs更容易被ZSM-5分子筛吸附.这6种VOCs中,ZSM-5分子筛对丙酮的吸附效果最好,硅铝比对其吸附性能的影响也最大.这是因为丙酮比其他VOCs更容易吸附在Lewis酸位点上,硅铝比的改变会影响酸位点的数量.低硅铝比的分子筛由于具有较多的酸位点,更适用于丙酮的吸附.
A series of ZSM-5 molecular sieves with wide silica-to-aluminium ratios(50,100,150,300,500,800,1500,3000)were successfully synthesized by hydrothermal method,aiming to study their effects on typical volatile organic compounds(volatile organic compounds,VOCs)in the coating industry.Meanwhile,the acidic sites on the surface of the molecular sieves were combined in order to resolve the mechanism of the influence of the silica-aluminium ratio on the adsorption performance of the molecular sieves.The experimental results showed that the adsorption capacity of acetone was mainly affected by its own polarity,branched structure and acid sites on the surface of molecular sieves.The adsorption performance of butyl acetate,styrene,p-xylene,benzene and toluene would be affected by their own molecular weight,molecular diameter,polarity,molecular structure and functional groups at the same time,and VOCs with large molecular weights and molecular diameters,high polarity and branched structures were more likely to be adsorbed by ZSM-5 molecular sieves.Among these six VOCs,ZSM-5 molecular sieve showed the best adsorption effect on acetone,the silica-aluminium ratio had the greatest effect on its adsorption performance,because acetone is more easily adsorbed on Lewis acid sites than the others,the change of silica-aluminium ratio will affect the number of acid sites.The molecular sieves with low silica-aluminium ratio are suitable for acetone adsorption due to their higher number of acid sites.
冀钟;赵彦玲;陈雨濛;高林霞;王翼鹏;刘欢
湖北工业大学土木建筑与环境学院,湖北 武汉 430068||深圳华中科技大学研究院,广东 深圳 518063深圳华中科技大学研究院,广东 深圳 518063||华中科技大学能源与动力工程学院,湖北 武汉 430074湖北工业大学土木建筑与环境学院,湖北 武汉 430068宇星科技发展(深圳)有限公司,广东 深圳 518057
化学工程
ZSM-5分子筛吸附剂硅铝比吸附涂装挥发性有机物Lewis酸位点
ZSM-5 molecular sievesadsorbentssilicon-aluminum ratioadsorptionvolatile organic compounds in coatingsLewis acid sites
《化工学报》 2024 (006)
2332-2343,封1 / 13
深圳市技术攻关面上项目(JSGG20210802154804013)
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