复合调变的铈基和钛基复合氧化物的结构与性能

The Ce-based and the Ti-based composite oxides are widely used in the environmental protection as catalysts. The jointly modification is an important method to improve the catalytic activities. In this project, the jointly modificated Ce -based and Ti -based composite oxides will be prepared by hydrothermal, microwave synthesis and sol-gel with microwave method, and characterized by X-Ray diffaraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), atomic force microscope (AFM), magic angle nuclear magnetic (MASNMR) and X-Ray photoelectron spectroscopy (XPS). The effects of the crystal structure and the surface structure microchange of the jointly modificated composite oxides will be analyzed. And then, the interaction of the jointly modificated composite oxides will be characterized by the temperature programmed reduction (TPR). In the end, the CO oxide reaction at the low temperature and the DeNOx performance of the jonitly modificated Ce-based composite oxides and the photocatalysis of the jonitly modificated Ti-based composite oxides will be studied respectively. According to the above results, we could come to the conclusion of the relation of the crystal structure and the surface structure microchange of the jonitly modificated composite oxides and its catalytic performance.

铈基和钛基复合氧化物是环保催化中应用广泛的催化剂，对它们的复合调变是提高其催化活性的重要方法。本课题拟采用水热合成、微波无机合成和溶胶凝胶+微波等方法制备复合调变的铈基和钛基复合氧化物。采用多晶X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)、原子力显微镜(AFM) 、魔角核磁(MAS NMR)和X光电子能谱(XPS)对复合调变的复合氧化物的体相晶体结构和表面结构进行表征，探索过渡金属元素复合调变对铈基和钛基复合氧化物物相晶体结构的影响，并利用程序升温还原(TPR)考察所制备复合调变复合氧化物各物相间的相互作用；同时考察复合调变的铈基复合氧化物低温CO的催化氧化活性和DeNOx性能及钛基复合氧化物光催化剂的光催化活性。并总结复合调变复合氧化物的晶体结构与表面结构变化规律及其与催化性能的关系。

CO和NOx已成为我国今后一段时间内的减排重点。催化消除NO和CO一直是环境催化领域的研究热点，对于如何提高催化剂的低温活性和高温热稳定性是推广催化消除NO技术的重要因素。本课题针对我国丰富的二氧化钛和二氧化铈资源及其在催化方面的独特性能，希望通过研究钛基和铈基催化剂在环境领域中的催化作用，推进环境保护技术的进步，为国民经济发展做出贡献。研究表明，钛基和铈基催化剂在大气分子污染物消除方面主要表现为热稳定性高、抗中毒和低温活性好等。同时，含铈基的负载型催化剂，不仅有较大的比表面积和高温稳定性，而且有较宽的组成调变范围。本项目以铈基和钛基负载型催化剂的表征及其对NO、CO的消除及光催化性能为研究对象，系统考察此催化剂的制备规律、表面活性组分的结构及其在“NO+CO”、“CO+O2”反应中和有机物降解催化活性的关系，为设计开发经济实用的多功能催化剂提供基础参考，并针对我国特色工业研发出经济、适用、高效的催化剂产品。项目资助发表SCI论文23篇，待发表论文4篇。培养博士生2名，已取得博士学位。硕士生6名，已取得硕士学位。项目投入经费是41万，支出35.9249万元，各项支出基本与预算相符。剩余经费5.0751万元，剩余经费计划用于本项目研究后续支出。