摘要
以硝酸氧锆（zrO（NO3）2·2H2O）为起始原料，采用醇-水溶液加热法结合超临界流体干燥制备了ZrO2气凝胶,通过XRD、TEM、BET等手段考察了制备条件及焙烧温度对所得ZrO2气凝胶织构、结构的影响．结果表明：醇-水比例、锆盐浓度、陈化时间等制备条件对ZrO2气凝胶织构、结构有较大的影响；醇．水体积比为4：1、锆盐浓度为0.2mol／L、陈化5h制得的ZrO2气凝胶的比表面积达668．2m^2／g；在焙烧温度为400-700℃的温度范围，呈单一稳定四方晶相结构．
ZrO2 aerogel were prepared from ZrO（ NO3 ）2· 2H2O by heating of alcohol-aqueous salt solution and supercritical fluid drying technique. The aerogel was characterized by XRD, TEM and BET. The results indicate that the volume ratio of alcohol to water （R/H）, the concentration of the zirconium salt and aging time have significant effect on texture and structure of the ZrO2aerogel. At optimum preparation conditions （R/H 4, zirconium salt concentration 0.2 tool/L, aging 5 hour）, SBET of ZrO2 aerogel can reach 668.2 m2/g, and the crystal structure of ZrO2 is always tetragonal in the calcining temperature range of 400℃ to 700℃.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2006年第6期539-544,共6页
Journal of Molecular Catalysis(China)
基金
山西省科委攻关项目资助(031099)
太原市科技攻关项目资助(030701)
