摘要
ＳｉＯ_２气凝胶超细粉由ＴＥＯＳ（正硅酸乙酯）在乙醇溶液中水解聚合后经超临界流体干燥（ＳＣＦＤ）制得。本文考察了ＴＥＯＳ的浓度、水和ＴＥＯＳ的摩尔比以及焙烧温度对超细粉织构性能的影响。结果表明，超细ＳｉＯ_２的比表面积、总孔容、孔分布、最可几孔径及表现堆密度均随制备参数而改变。而以ＳｉＯ_２气凝胶超细粉体为基本载体材料的Ｃｏ／ＺｒＯ_２－ＳｉＯ_２催化剂显示出高的ＣＯ＋Ｈ_２合成重质烃的活性和选择性。
Homogeneous SiO2 aerogels are made by hydrolysis and polymerization of TEOS in ethanol solution followed by supercritical fluid drying.The aerogels so obtained exhibit high surface area(1195m2/g),small particle size(2.0nm),large pore volume(3.53cm3/g)and low apprent density(0.04g/cm3).The effects of some preparation parameters,such as concentration of TEOS in ethanol,H2O/TEOS molar ratio and calcination temperature are studied.The results show that surface area,pore size distribution,total pore volume and apparent density are influenced by these parameters.Cobalt catalyst supported on ZrO_2 modified SiO_2 aerogel shows high Fischer-Tropsch synthesis activity and heavy products selectivity.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1996年第6期517-521,共5页
Journal of Fuel Chemistry and Technology
关键词
二氧化硅
溶胶凝胶法
气凝胶
SiO_2, sol-gel method,preparation parameter,texture property
