title: Significant improvement of thermal stability for CeZrPrNd oxides simply by supercritical CO(2) drying.
abstract: Pr and Nd co-doped Ce-Zr oxide solid solutions (CZPN) were prepared using co-precipitation and microemulsion methods. It is found that only using supercritical CO(2) drying can result in a significant improvement of specific surface area and oxygen storage capacity at lower temperatures for CZPN after aging at 1000°C for 12 h in comparison with those using conventional air drying and even supercritical ethanol drying. Furthermore, the cubic structure was obtained in spite of the fact that the atomic ratio of Ce/(Ce+Zr+Pr+Nd) is as low as 29%. The high thermal stability can be attributed to the loosely aggregated morphology and the resultant Ce enrichment on the nanoparticle surface, which are caused by supercritical CO(2) drying due to the elimination of surface tension effects on the gas-liquid interface.
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, P. R. China.
authors: Yunzhao
authors: Y
authors: Fan
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, P. R. China.
authors: Zizi
authors: Z
authors: Wang
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, P. R. China.
authors: Ying
authors: Y
authors: Xin
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, P. R. China.
authors: Qian
authors: Q
authors: Li
authors: School of Chemistry and Chemical Engineering, University of Jinan, Jinan, P. R. China.
authors: Zhaoliang
authors: Z
authors: Zhang
authors: State Key Laboratory for Rare Earth Materials Chemistry and Applications, Peking University, Beijing, P. R. China.
authors: Yingxia
authors: Y
authors: Wang
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry; D002563:Cerium / Q000737:chemistry*; D003890:Desiccation / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry; D009354:Neodymium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011221:Praseodymium / Q000737:chemistry*; D013500:Surface Tension; D015040:Zirconium / Q000737:chemistry*
chemical_list: D010087:Oxides; D002245:Carbon Dioxide; D009354:Neodymium; D002563:Cerium; D015040:Zirconium; D011221:Praseodymium