Nanocrystal-mesoporous structure cerium-zirconium-aluminum-based composite oxide oxygen storage material and preparation method thereof

The invention belongs to the technical field of industrial catalysis, and particularly relates to a nanocrystalline-mesoporous structure cerium-zirconium-aluminum-based composite oxide oxygen storage material and a preparation method thereof. Comprising the following steps: (1) mixing and dissolving cerium salt, zirconium salt, aluminum salt and doped element salt, adding a template agent under the stirring action, and continuously stirring for 0.5-1 hour to obtain a uniformly mixed salt solution A; (2) adding 2-3 times of water into stronger ammonia water with the concentration of 25-28wt% to dilute the stronger ammonia water, and using the diluted stronger ammonia water as a precipitant B; (3) dissolving a dispersing agent in water to obtain a dispersing agent solution C; and (4) stirring the dispersing agent solution C, simultaneously pumping the mixed salt solution A and the precipitator B, and continuously stirring for a period of time after the reaction is finished to obtain slurry and the like. The tem