项目名称： 低温等离子体协同吸附-分解NOx机理研究及催化剂的结构设计与优化

项目编号： No.21507004

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 化学工业

项目作者： 于庆君

作者单位： 北京科技大学

项目金额： 21万元

中文摘要： 氮氧化物（NOx）作为大气主要污染物之一，严重危害环境和人类身体健康，对其治迫在眉睫。催化剂是脱硝工艺的核心，设计高活性、高稳定性的脱硝催化剂的前提就是深入认识催化剂上NOx脱除活性位的形成及其影响因素。本项目主要进行吸附-低温等离子体（NTP）协同催化分解NOx的反应体系中高性能催化剂的制备研究。向具有相似性质的ZSM-5和ZSM-11分子筛中通过离子交换引入铜物种，对比研究其吸附分解活性以及结构性质，分析活性位的存在形式以及分布；通过改变载体分子筛的孔结构以及外表面明确活性位形成以及分布的影响因素；通过对稀土改性催化剂的抗氧性研究来揭示储氧活性位的结构和性质；通过对不同硅铝比载体负载活性组分后抗水性的研究来揭示催化剂抗水性能的原理。在上述工作的基础上，采用直接合成法一步制备出具有抗氧疏水性的高活性和稳定性的NOx吸附-NTP分解催化剂。

中文关键词： 沸石分子筛；催化活性；选择性；氮氧化物；催化分解

英文摘要： As one of the major air pollutants, nitrogen oxide (NOx) has a devastating effect on environment and human health. Therefore, it is extremely urgent to develop a novel and efficient de-NOx strategy. Catalyst is the core of the de-NOx technology. In order to design a catalyst with high activity and stability, the activity sites for NOx removal in a catalyst and the factors which can influence the formation of these sites should be deeply understood. In this project, the study was mainly to focus on the preparation of catalyst with good adsorption-decomposition NOx performance in a combined adsorption-low-temperature discharge plasma （NTP）catalytic process. Copper species were introduced into ZSM-5 and ZSM-11 zeolites with the similar composition via an ion exchange method, respectively. The formation and distribution of active sites in the zeolite channels were analyzed by comparing the adsorption-decomposition activity and texture properties of Cu-ZSM-5 and Cu-ZSM-11. The factors that affecting the formation and distribution of active sites were investigated by choosing parent zeolites with various pore structures and external surface areas. The oxygen-trap sites were revealed by investigating the oxygen-tolerant capacity of catalysts modified with rare earth element. Zeolites with different Si/Al ratios were chosen as support to display the water resistant capacity of catalysts. On the basis of the above work, a direct synthesis method would be applied to prepare the catalyst with a superior resisted oxygen and water capability as well as high adsorption-decomposition performance in a combined adsorption-discharge plasma catalytic decomposition process of nitrogen oxides.

英文关键词： Zeolite;Catalytic activity;Selectivity;NOx;Catalytic decomposition