钡对氧化铝的高温热稳定作用  

Thermal Stabilization of Barium on the Alumina at High Temperature

作　　者：刘勇[1] 王敬先[1] 杨竹仙[1] 何阿弟[1] 陈晓银[1] 

机构地区：[1]复旦大学环境科学与工程系,上海200433

出　　处：《物理化学学报》2000年第6期533-537,共5页Acta Physico-Chimica Sinica

基　　金：福特-中国研究与发展基金!(9712303)资助项目

摘　　要：The thermal stabilization mechanism of barium and the effects of preparation methods, barium content and calcination temperature were studied by BET specific surface area and powder X ray diffraction. It was found that barium can stabilize the alumina at high temperature (1000 ℃) and the stabilization effect was enhanced with the increase of the barium content, whereas, the overabundance weakened the stabilization effect. The preparation methods influenced the thermal stability of alumina and the stabilization effect of barium. At high temperature, the stabilization effect of barium species can be attributed to the dispersed baria and not hexaaluminate retarding the loss of specific surface area due to the sintering and αphase transformation within the initial 1 h of the calcination process.The thermal stabilization mechanism of barium and the effects of preparation methods, barium content and calcination temperature were studied by BET specific surface area and powder X ray diffraction. It was found that barium can stabilize the alumina at high temperature (1000 ℃) and the stabilization effect was enhanced with the increase of the barium content, whereas, the overabundance weakened the stabilization effect. The preparation methods influenced the thermal stability of alumina and the stabilization effect of barium. At high temperature, the stabilization effect of barium species can be attributed to the dispersed baria and not hexaaluminate retarding the loss of specific surface area due to the sintering and αphase transformation within the initial 1 h of the calcination process.

关 键 词：氧化铝 热稳定性 钡 改性 汽车催化剂 

分 类 号：O614.2[理学—无机化学]