【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0.2 mol/L、陈化5h制得的ZrO2气凝胶的比表面积达668.2 m2/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.更多还原

【Abstract】 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 mol/L,aging 5 hour）,S_BET of ZrO₂aerogel can reach 668.2 m²/g,and the crystal structure of ZrO₂ is always tetragonal in the calcining temperature range of 400℃ to 700℃.更多还原