Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (08): 1342-1346.doi: 10.1016/S1872-1508(08)60056-X

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Structure Evolution Process of Ce0.65Zr0.25Y0.1O1.95 Prepared by Oxidation-Coprecipitation Method

ZHANG Lei, ZHENG Ling-Min, GUO Jia-Xiu, WU Dong-Dong, GONG Mao-Chu, WANG Jian-Li, CHEN Yao-Qiang   

  1. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2008-01-23 Revised:2008-04-21 Published:2008-08-06
  • Contact: CHEN Yao-Qiang E-mail:yqchen@email.scu.edu.cn

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Abstract: Ce0.65Zr0.25Y0.1O1.95 oxides were prepared by oxidation-coprecipitation method using ammonia and salvolatile as precipitators. The as-prepared samples were thermally treated at different temperatures and characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform-infrared (FT-IR) spectrometry, X-ray diffraction (XRD), and specific surface area measurements (BET). The results showed that the hydroxyl and carboxyl groups coexisted in the precipitate and a perfect solid solution was gradually formed with an increase in calcination temperature. The physisorbed water was lost from 100 to 170 ℃, hydroxyl groups were removed from 250 to 300 ℃, and the carboxyl groups were eliminated from420 to 500 ℃. A structure model was further proposed to understand the Ce0.65Zr0.25Y0.1O1.95 structure evolution process in depth.

Key words: CeO2-ZrO2-Y2O3, Structure evolution, Oxidation-coprecipitation