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METHOD OF MAKING MESOPOROUS ZIRCONIUM-BASED MIXED OXIDES
METHOD OF MAKING MESOPOROUS ZIRCONIUM-BASED MIXED OXIDES
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机译:制备介孔锆基混合氧化物的方法
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摘要
Mesoporous, zirconium-based mixed oxides and a method of making the same comprises: injecting a polyvalent metal-containing solution into an electrolyte solution to form a mother liquor; forming a precipitate; aging the precipitate in the mother liquor to form the mixed oxides; washing the mixed oxides with an aqueous medium; drying and collecting the mixed oxides. The pH of the electrolyte solution exceeds the isoelectric point for zirconium-based mixed oxides. The mixed oxides exhibit a single particle size distribution, improved Ce02 reducibility in the presence of Rhodium, a decrease in surface area after calcination (800-1 100° C.) that is not more than 55%, and a tetragonal/cubic structure after calcination. After calcination at 1 100° C. for 10 hours in air, the mixed oxides exhibit a surface area 25 m2/g, a pore volume 0.20 cm3/g, an average pore size 30 nm, and an average crystallite size between 8-15 nm.
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