Adsorption performance and mechanism of ZSM-5 molecular sieves on typical coating VOCs
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.
ZSM-5 molecular sievesadsorbentssilicon-aluminum ratioadsorptionvolatile organic compounds in coatingsLewis acid sites
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