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分别利用固态反应和共沉淀法制备了铈锆固溶体,并以其为载体制备了车用三效催化剂,考察其在CH4和CO催化燃烧反应中的作用.研究发现固态反应法所得固溶体孔分布较宽,热稳定性较差,但表面较多的缺陷位贡献于其较高的储氧性能.而共沉淀法所得样品拥有较高的热稳定性和催化活性.固溶体的还原性质可以通过铈锆比调控.关联催化剂对CH4和CO的催化氧化性能发现,具有较大比表面积、集中孔径分布和较高储氧能力的固溶体显示了较低的催化剂起燃温度和较高的催化活性.
The solid-state reaction and coprecipitation method were respectively used to prepare the solid solution of cerium and zirconium, and the three-way catalyst for vehicle was prepared for its catalytic effect on the catalytic combustion of CH4 and CO. The results show that the solid solution reaction pore distribution Wide and poor thermal stability, but more defects on the surface contribute to its higher oxygen storage performance.The coprecipitation method obtained samples have high thermal stability and catalytic activity.The reduction properties of solid solution can be determined by cerium zirconium The results showed that the solid solution with larger specific surface area, concentrated pore size distribution and higher oxygen storage capacity showed lower catalyst light-off temperature and higher catalytic activity.