1 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China
Abstract: Volatile organic compounds (VOCs) do great harm to both the environment and human health and therefore it is urgent to develop new technologies for VOCs removal. Commonly, the treatment methods of VOCs include adsorption, biological, absorption, condensation and catalytic combustion, etc. In recent years, the treatment route of combining both adsorption and catalytic combustion was proposed, aiming at the treatment of VOCs with low concentration, large air volume and low temperature produced in industrial production. Adsorbent is the key for the adsorption technology. The common adsorption materials contain activated carbon, silica gel, molecular sieves, etc. Among them, zeolites with MFI topology have been widely used in the field of VOCs removal due to the special pore structure and adjustable Si/Al ratio. MFI zeolite mainly includes ZSM-5, Silicalite-1 and TS-1 according to the different compositions. As an adsorbent, the adsorption results of different VOCs have been influenced by its pore structure and surface properties. In the industrial purification process, the water in VOCs greatly reduces the adsorption capacity of zeolites. Therefore, in recent years, except for studying to improve the saturated adsorption capacity of zeolites for VOCs, the researchers paid more and more attention to improving the adsorption capacity of adsorbents under humid atmosphere. Generally, methods of increasing the silicon-alumina ratio and by surface silanization modification are applied to increase the adsorption perfor-mance of MFI-type zeolites in humid conditions. MFI-type zeolites can also be used as catalyst supports. For the supported catalyst, both the active components and supports properties determine the VOCs removal efficiency of catalysts. The VOCs catalytic oxidation performance of catalysts can be effectively improved by choosing appropriate composite active components, suitable support structures as well as superior catalyst preparation methods. In this paper, the main research results and progress of MFI-type zeolites applied in the field of VOCs removal were summarized. In detail, the structure, properties of MFI-type zeolites as well as their application in VOCs removal via adsorption or catalytic oxidation technology were illustrated. Based on these, the application prospect of MFI-type zeolites is analyzed and prospected, according to the emission characteristics of industrial VOCs sources.
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2020, Vol. 34 
