MCM-41改性三元催化剂对乙醇汽油车冷启动排放醇醛的净化性能研究

针对乙醇汽油车冷启动排放的醇醛污染物，将织构性能优异的MCM-41引入传统三元催化剂(TWCs)的载体材料氧化铝中，不仅保持现有TWCs的三效催化活性和热稳定性，还能强化催化剂对醇醛的低温吸附和催化燃烧性能，从而保证乙醇汽油车冷启动排放醇醛的彻底净化。分别采用水热合成法、共沉淀法制备MCM-41和氧化铝，混合浸渍活性组分后负载于堇青石上制得整体式催化剂。沿着技术路线“载体改性—三效活性评价—醇醛净化性能测试”达成研究目标。采用表面活性剂、原子掺杂和表面修饰等手段优化MCM-41改性TWCs的织构性能、热稳定性能及表面性能，以获得更高的醇醛低温吸附容量、更快的吸附速率以及更优异的催化燃烧性能。同时结合催化剂的各项理化性能表征结果、吸附和催化燃烧规律，探索醇醛在MCM-41改性TWCs上的吸附和催化燃烧机理。本项目的实施可为成功开发乙醇汽油车尾气净化专用催化剂提供理论支持。

Aiming at alcohol aldehydes from gasohol vehicles during cold start, MCM-41 with excellent texture property is incorporated into aluminum oxide, the support of Three Way Catalysts(TWCs). Not only are the three-way catalytic activity and thermal stability of existing TWCs maintained, but also the performance of alcohol aldehydes adsorption and catalytic combustion are strengthened. So alcohol aldehydes can be thoroughly cleaned in this way. MCM-41 and aluminum oxide will be prepared by hydrothermal synthesis and co-precipitation respectively, then mixed and impregnated with active ingredients, finally loaded on cordierite to obtain monolithic catalysts. The research objectives will be achieved by following technology route “support modification—three-way activity evaluation—alcohol aldehydes purification performance”. The texture, thermal stability, and surface properties of MCM-41 modified TWCs will be optimized by using different surfactants, ion doping and surface modification methods in order to obtain higher adsorption capacity, faster adsorption rate and better catalytic combustion performances. Combined the physical and chemical characterization of the catalysts with adsorption and catalytic combustion law, the adsorption and catalytic combustion mechanism will be explored. The implementation of this project will provide theoretical support for successful development of gashol exhaust purification catalysts.