双活性组分小孔分子筛用于脱硝反应中的构效关系及抗中毒性能研究

项目名称： 双活性组分小孔分子筛用于脱硝反应中的构效关系及抗中毒性能研究

项目编号： No.51508231

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 其他

项目作者： 谢利娟

作者单位： 江南大学

项目金额： 20万元

中文摘要： 氮氧化物（NOx）是灰霾形成的重要前体污染物，NH3选择性催化还原NOx（NH3-SCR）是目前柴油车尾气NOx去除的主流技术。相比于其他NH3-SCR催化剂，双活性组分小孔分子筛Fe-Cu-SSZ-13具有更为优异的水热稳定性和抗硫抗水中毒能力，其构效关系和抗中毒机制的研究对催化剂的进一步改良具有十分重要的意义。本项目采用多种表征手段，探讨Fe-Cu-SSZ-13催化剂表面双活性组分物种的存在状态、相互作用等对催化剂催化性能的影响规律，制备催化活性优异、水热稳定性高、抗硫抗水能力强的Fe-Cu-SSZ-13催化剂；通过解析水、硫共存对催化剂理化性质和活性物种的影响，揭示催化剂的抗硫抗水中毒机制；调变反应气氛，剖析NO2对催化剂抗硫抗水中毒能力的影响规律；以上研究成果将为研制可满足柴油车尾气净化需求的新型催化剂提供科学依据和技术储备。

中文关键词： NOx控制；NH3选择性催化还原；双活性组分小孔分子筛；构效关系；抗中毒性能

英文摘要： Oxides of nitrogen (NOx) in the atmosphere, as key precursory pollutants, induce the formation of haze. The selective catalytic reduction of NOx by NH3 (NH3-SCR) is one of the most promising technologies for NOx emission control from diesel engines. Compared with other NH3-SCR catalysts, Fe-Cu-SSZ-13, bimetallic-based small-pore zeolites, showed higher hydrothermal stability and better sulfate and water durability. The study on its structure-activity relationship and resistance to poisoning is very important for the further catalytic performance improvements. In this study, many characterization methods will be used for probing the state of active species and interaction caused by bimetal, and the results will be correlated to their catalytic performance. The relationship will provide a guideline for designing catalysts with excellent NH3-SCR activity, high hydrothermal stability and good sulfate and water durability. Based on the effect of water and sulfate on the physiochemical properties and active species, poisoning mechanism of SO2 and H2O on NH3-SCR reaction over the optimized Fe-Cu-SSZ-13 catalyst will be investigated. The effect of NO2 on the poisoning resistance of Fe-Cu-SSZ-13 catalyst will be also studied. These results will provide theoretical basis and basic data for the developments of new catalysts used for diesel engines exhaust purify.

英文关键词： NOx abatement;NH3-SCR;bimetallic-based small-pore zeolites;structure-activity relationship;resistance to poisoning