高热稳定性的纳米空心结构钛基催化剂的制备及其NH3选择性催化还原NOx性能研究

Nitrogen oxide (NOx) is one of the main pollutants in the formation of haze, which is harmful to the ecological environment and human health. In the national 12th Five-Year Plan, NOx has become the focus of emission reduction. The selective catalytic reduction of NOx with NH3 (NH3-SCR) is proved to be an effective way for NOx abatement. Therein, the NH3-SCR catalyst is the most important. Titanium-based catalysts in the NH3-SCR reaction show fast and efficient reduction, good activity, high stability, resistance to poisoning, and other advantages. Hence, in the project, we will obtain the carbon sphere and helical carbon chain templates by filtration, and synthesize titanium-based hollow nanospheres and helical nanotubes with mixed compositions, varied structures and high thermal stability by the template method and sol-gel method. Then we will modify these titanium-based materials by metal doping and surface deposition of foreign metals. With the aid of a series of characterization techniques like TEM, XPS and in situ FTIR, we will investigate the interaction between special structure, exposed crystalline facets and the modification components, and its influence on the adsorption property and NH3-SCR catalytic property, approach the structure-activity relationship of these titanium-based catalysts, and explore their microcosmic mechanism of NH3-SCR. We hope that the results will be offered to explore the novel and practical deNOx catalysts and a contribution would be made to the development of environment protection techniques after the project proceeding.

氮氧化物（NOx）是形成雾霾的主要污染物之一，对生态环境和人体健康危害极大。我国“十二五”计划已将NOx列为减排重点。实践证明，NH3选择性催化还原NOx技术（NH3-SCR）是净化NOx的有效手段，而催化剂就是该技术的核心。钛基催化剂在NH3-SCR反应中表现出快速高效、活性好、稳定性高和抗中毒能力强等优势。本项目拟通过过滤分离出碳球和螺旋碳链模板，采用模板法和溶胶-凝胶法相结合的制备方法，一体化合成具有复合组成、不同结构、高热稳定性的纳米空心球和螺旋管钛基材料，并对该材料进行掺杂和负载改性处理。通过TEM、XPS、原位红外等多种表征手段，研究材料的特殊结构、暴露晶面与改性组分间的相互作用，及其对材料吸附性能和NH3-SCR催化性能的影响，探究此类钛基催化剂的构效关系，揭示其NH3-SCR微观反应机理，为设计开发实用经济的脱硝催化剂提供基础参考，推进环境保护技术的进步。

氮氧化物（NOx）是形成雾霾的主要污染物之一，对生态环境和人体健康危害极大。我国“十二五”计划已将NOx列为减排重点。实践证明，NH3选择性催化还原NOx技术（NH3-SCR）是净化NOx的有效手段，而催化剂就是该技术的核心。钛基催化剂在NH3-SCR反应中表现出快速高效、活性好、稳定性高和抗中毒能力强等优势。本项目通过过滤分离出碳球和螺旋碳链模板，采用模板法和溶胶-凝胶法相结合的制备方法，一体化合成具有复合组成、不同结构、高热稳定性的纳米空心球和螺旋管钛基材料，并对该材料进行掺杂和负载改性处理。通过TEM、XPS、原位红外等多种表征手段，研究材料的特殊结构与改性组分间的相互作用，及其对材料吸附性能和NH3-SCR催化性能的影响，探究此类钛基催化剂的构效关系，揭示其NH3-SCR微观反应机理，为设计开发实用经济的脱硝催化剂提供基础参考，推进环境保护技术的进步。