Preparation and application of monolithic molecular sieve-based catalysts in microwave catalytic combustion of VOCs
LIU Shuang1, BO Long-li1,2, NING Ke1, ZHANG Ting-ting1, LIU Jia-dong1,2
1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Key Laboratory of Environmental Engineering of Shaanxi Province, Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
Monolithic honeycomb molecular sieve carriers were used to prepare copper, manganese and cerium supported catalysts. The catalytic performance and stability of the catalyst were investigated by microwave-assisted catalytic combustion of VOCs (toluene, acetone, ethyl acetate). And affecting factors of catalytic activity were analyzed and temperature distribution of the bed was tested simultaneously. The removal efficiency of VOCs with an initial concentration of 200~2000mg/m3 was between 80% and 92% under conditions of microwave power 1.3kW, catalyst bed volume 300'm×300mm×300mm, reaction temperature of the fixed bed higher than 300℃, and air volume 5m3/h. Temperature was a prerequisite for the oxidative degradation of VOCs, and the effect of temperature rising on the degradation of VOCs was no longer obvious after the bed temperature exceeded 300℃. Monometallic oxides of copper, manganese and cerium and their composite oxides were main active components with spinel structure. VOCs were oxidized on the surface of the active components that followed by pseudo-first order reaction. Cu-Mn-Ce/Molecular sieve honeycomb catalyst had both high catalytic activity and good stability after six-time repetitive tests although high temperature made some changes for the structure.
刘双, 卜龙利, 宁珂, 张婷婷, 刘嘉栋. 整体式分子筛基催化剂制备及其微波催化燃烧VOCs[J]. 中国环境科学, 2020, 40(11): 4688-4696.
LIU Shuang, BO Long-li, NING Ke, ZHANG Ting-ting, LIU Jia-dong. Preparation and application of monolithic molecular sieve-based catalysts in microwave catalytic combustion of VOCs. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4688-4696.
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