Applying Microwave-induced Catalytic Reaction to Environmental Purification: a Review
LYU Xiujuan1, TANG Xiaolong1,2,*, YI Honghong1,2, ZHAO Shunzheng1,2, REN Chenyang1
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: Catalytic purification has been developed to be a main technology involving with the removal of environmental pollutants. Microwave (MW) radiation with excellent performances of volatility, high frequency, thermal and non-thermal characteristics has caused widely attention. Therefore, MW-induced catalytic reactions play a vital role in improving environmental quality. With the continuous in-depth research of MW radiation and catalytic technology, the development of multifunctional materials with excellent MW absorbing performance and catalytic activity has become the focus of studies. According to the way of transforming the MW, wave-absorbing materials can be divided into three types, including dielectric loss, resistance loss and magnetic loss.The absorbing performance of the wave-absorbing materials is affected by various factors such as element composition, surface configuration and pore structure. In recent years, researchers have been improving the synthetic methods of wave-absorbing materials from the matching and attenuation characteristics, and have achieved substantial progress in enhancing the MW absorbing properties of mate-rials, and making full use of MW-induced catalytic reactions to improve the energy utilization rate as well as the degradation rate of environmental pollutants. Wave-absorbing materials will produce hot spot effect and discharge effect in the MW field. The MW-induced catalytic reaction changes the conventional thermal field to MW heating, which can realize the rapid temperature rise of the material at a lower environment temperature and achieve excellent catalytic performance. Metal materials can induce MW discharge in the MW field, and the discharge process will produce thermal effect, plasma effect and photocatalytic effect, which plays a crucial role in pollutant removal. However, since the reaction process of MW-induced cata-lysis is complicated, current studies have focused on distinguishing the influence of heat spot effect and discharge effect and clarifying the reaction pathway of MW-induced catalysis. Over the past years, a variety of catalysis with outstanding wave-absorbing and catalytic performances has been developed, and applied the MW-induced catalytic reaction to the purification treatment technology of waste water and exhaust gas, which has the advantages of fast reaction rate and high treatment efficiency. This paper mainly introduces the principle of MW absorption of materials, expounds the improvement of MW absorption properties of materials and the application of MW hot spot effect and discharge effect in pollutant removal, and discusses the future development direction of MW-induced catalytic reactions.
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2022, Vol. 36 
