Direct preparation of Cerium Zirconium Solid Solution with Microbubble Hollow Structure by Spray Pyrolysis
Cerium-zirconium solid solution has shown excellent properties in various functional materials,and has become one of the hot spots in the preparation of high-performance materials at present;There are many preparation methods of cerium-zirconium solid solution,and the reported preparation methods have their own ad-vantages and disadvantages.Spray pyrolysis simplifies the preparation process,reduces the cost and is benefi-cial to industrial application.Cerium-zirconium composite oxide precursor containing carbon was prepared by spray pyrolysis with zirconia chloride and cerium chloride as raw materials and citric acid as auxiliary.After sec-ondary calcination,cerium-zirconium composite oxide with low chlorine,hollow structure and specific surface area of 22.8～36.3 m2·g-1 was successfully prepared.The samples were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM)and specific surface area analysis(BET).The results of FESEM show that the thickness of the samples becomes thinner with the increase of the molar ratio of citric acid.BET analysis results show that the specific surface area of the sample has a maximum value in the molar ratio of cerium-zirconium-citric acid,and reaches the maxi-mum value when the molar ratio is 1∶1.5,which is about 36.3 m2·g-1.The particle size of the prepared micro-bubble hollow structure is between 1.1 and 11.3 μm.
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