调控氧化还原性和表面酸性协同作用设计高效低温催化氨选择性还原氮氧化物催化剂

针对我国工业锅炉NOx烟气排放特点，解决低温高活性NH3-SCR脱硝催化剂应用的瓶颈问题具有重要的理论和实际意义。在我们前期研究的基础上，本项目拟选择Cu、Mn和Fe为主催化组份，Ti氧化物作为载体/组份，通过添加金属M（Nb、W、Mo和Ce）制备一系列具有不同氧化还原能力和表面酸性的氧化物催化剂，构建不同比例的L酸性位和B酸性位，深入系统分析氧化还原性与酸性协同作用对活性的影响；提出协同作用影响的定量参数模型。结合理论计算和原位红外光谱等各种表征手段研究金属的掺杂对活性金属的分散、电子分布、氧化还原性质、酸性和晶体结构的本质影响；明确提高低温抗水抗硫性能的本质。筛选出具有高的低温活性和抗水抗硫性能，宽活性窗口的非钒NH3-SCR脱硝催化剂。为研发设计合成具有自主知识产权的低成本、耐水抗硫中毒的、高效低温的NH3-SCR脱硝催化剂及其技术奠定基础。

In view of the characteristics of NOx emission from industrial coal-fired boilers in China, it is of great theoretical and practical significance to solve the bottleneck problem in the application of NH3-SCR of NOx catalyst with low-temperature and high-activity. Based on the results of our previous studies, this project intends to select Cu, Mn and Fe as the main catalytic components, and Ti oxide as the carrier/component, and prepare a series of oxide catalysts with different redox ability and surface acidity by adding metal M (Nb, W, Mo and Ce), to construct different proportions of L and B acids, analyze systematically the synergistic effect of redox and surface acidity on activity in-depth, and propose a quantitative parameter model of the synergistic effect. The essential characters of metal doping on the dispersion, electronic distribution, redox properties, acidity and crystal structure of the active metal are confirmed by the theoretical calculation and various characterizations special in situ DRIFTS. In addition, the catalytic mechanism of different catalysts is systematically studied to further clarify the nature and mechanism of water and sulfur resistance. A serial of non-vanadium NH3-SCR of NOx catalysts with high activity and SO2 and H2O resistance and wide active window can be synthesized and screened. Therefore, it is the foundation of the research and design of NH3-SCR of NOx catalyst with low cost, water and SO2 resistance, high efficiency for practical application of NOx emissions at low temperature.