一步水热合成柴油车用NOx净化分子筛催化剂

以Cu-SSZ-13为代表的Cu基小孔分子筛是目前主流的柴油车NOx净化催化剂。Cu-SSZ-39、Cu-ZJM-7和Cu-SSZ-50等新型Cu基小孔分子筛也具备应用潜力，但其传统的制备方法中包含多次的离子交换步骤，工艺复杂且产生废水较多。本项目拟开展Cu-SSZ-39、Cu-ZJM-7和Cu-SSZ-50等分子筛的一步水热合成技术，通过原料选择、晶化条件和后处理等方面的调控，优化上述分子筛的合成技术；探究一步水热合成法制备分子筛的水热稳定性和抗硫性，通过探究老化前后分子筛中活性Cu物种、骨架原子等变化，甄别影响催化剂水热稳定性和抗硫性的关键因子，通过对Cu物种和骨架原子的调控，优化催化剂水热稳定性和抗硫性；在对分子筛合成方法和性能优化的基础上，开发催化剂涂覆技术，通过对浆料粒径、固含量和粘度等关键工艺参数的调控，优化项目所用分子筛的涂覆工艺，并进行发动机台架实验，为其实际应用奠定基础。

Cu based small pore zeolites, such as Cu-SSZ-13 are nowadays utilized in the NOx abatement of diesel vehicles. Novel Cu based small pore zeolites, such as Cu-SSZ-39, Cu-ZJM-7 and Cu-SSZ-50 also possess great potential of application. However, massive ion-exchange processes and abundant effluent are the drawbacks of the conventional ion-exchange method for the zeolites mentioned above. The one-pot synthesis method of Cu-SSZ-39, Cu-ZJM-7 and Cu-SSZ-50 is going to be carried out in this project, aiming to improve the synthesis method of zeolites by the regulation from the aspects of raw materials, crystallization conditions and after-treatment processes. Hydrothermal stability and SO2 resistance of the one-pot synthesized zeolites will be tested and improved, with the key factors being identified. Finally, the coating processes of catalysts will be optimized from the aspects of slurry particle size, solids content and viscosity. The monolithic-supported catalysts will be tested, and the engine test will be carried out for the preparation of application. This project aims to contribute to the development of Cu based small pore zeolites from the aspects of synthesis method, resistibility and coating processes, and it will bring inspirations to the catalysts of next generations.