整体式分子筛基催化剂制备及其微波催化燃烧VOCs

以整体式蜂窝状分子筛为载体，制备铜锰铈负载型催化剂，研究其微波辐照下对VOCs （甲苯、丙酮、乙酸乙酯）的催化活性及其稳定性，探究影响催化剂活性的因素，并通过测试床层温度分布进行分析.研究表明，微波功率1.3kW、催化剂体积300mm×300mm×300mm，固定床温度>300℃条件下，催化剂对初始浓度200~2000mg/m³的5m³/h VOCs气体的降解效率为80%~92%.温度是VOCs氧化降解的条件，但当床层温度超过了300℃（VOCs完全燃烧温度）之后，升温对VOCs降解效率的影响不再明显.表征可知，尖晶石态铜锰铈单金属氧化物及其复合氧化物是主要的催化活性组分.VOCs在催化剂表面进行准一级反应而被催化氧化；高温对催化剂结构有一定影响，但重复性试验证实了催化剂的高活性和良好的稳定性.

Preparation and application of monolithic molecular sieve-based catalysts in microwave catalytic combustion of VOCs

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.