低温SCR催化剂的中毒机理与再生方法研究

During the period of the twelfth five-year plan, reducing NOx emissions is the primary task of China in atmospheric environment field. The research and development of low temperature SCR catalysts become a hot issue of academic and corporation fields in domestic and abroad. The group of Prof. He has obtained excellent low temperature SCR catalysts that the working temperature is low to 160 C. However, the SCR catalysts became inactive in the sulfurous gas because that the formed NH4HSO4（ABS） would condense and be attached on the surface of the catalysts. The application of the low temperature SCR catalysts in sulfurous flue gas is severely limited for the lack of clear understanding on the SO2 poisoning and regeneration mechanism over the low temperature SCR catalysts. For the above-mentioned problems, in this project, the SO2 poisoning and regeneration mechanism of low temperature SCR catalysts will be investigated. At the same time, the generative mechanism, conditions and migration rule of ABS on the surface of SCR catalysts will be studied. Moreover, in order to obtain an in-situ regeneration process of SCR catalysts at low temperature, the formation, enrichment,and transfer of ABS in the SCR reactor and insitu-regeneration techniques will be investigated. This project will develop a set of new technology solutions for low temperature DeNOx with sulfur contained smoke. In addition, this work will provid useful experimental data and theoretical support for the development of DeNOX technologies.

十二五"期间,我国在大气环境治理领域的重要任务是降低NOx排放。研发低温SCR催化剂成为国内外学术和工业界的一个热点问题。何洪教授课题组已经得到了工作温度低至160 C的高效低温SCR催化剂，但是，将其用于含硫烟气脱硝时，硫酸氢氨（ABS）在催化剂上冷凝附着导致催化剂失活。由于对低温SCR催化剂的SO2中毒与再生机理都缺乏清楚的认识，因此，阻碍了我们开发的低温SCR催化剂在含硫烟气中的应用。本课题针对以上问题对低温条件下SCR催化剂的SO2中毒与再生机理进行研究，同时对硫酸氢氨（ABS）在SCR催化剂表面上的生成机制、条件及迁移规律及其在低温SCR催化反应器中的生成条件、富集与中毒催化剂再生技术进行研究，以期能够获得在低温条件下的SCR催化剂原位再生技术，为含S烟气的低温脱硝探索出一套全新的技术方案。

在非电力行业推广使用低温SCR技术，具有巨大的社会效益和经济效益。本课题针对低温SCR脱硝催化剂的SO2中毒与再生的问题开展工作。通过离子修饰、SiO2掺入、变换载体等手段改善催化剂配方；研究新型钛硅分子筛、杂多酸催化材料，加深了SCR反应的认识；建立一种低温SCR催化剂SO2中毒机理的研究方法，并深入研究了硫酸氢铵在催化剂表面的分解行为，为低温SCR催化剂再生条件选择提供依据；建立了一套全尺寸SCR工程模拟反应系统，并研究了全尺寸蜂窝催化剂中毒机理和实现催化剂的原位再生；所得的研究成果已实现若干工程应用。本课题的开展为突破低温SCR催化剂在含硫烟气脱硝工程应用的技术障碍，实现含硫烟气的低温脱硝（如中小型燃煤锅炉）提供理论和技术基础。