钾霞石快速溶胶-凝胶法制备及表征  

Fast sol-gel synthesis and characterization of kalsilite

作　　者：郑骥[1] 马鸿文[1] 

机构地区：[1]中国地质大学矿物材料国家专业实验室

出　　处：《岩石矿物学杂志》2006年第4期341-344,共4页Acta Petrologica et Mineralogica

基　　金：教育部博士学科点研究基金资助课题(1999049114)

摘　　要：使用氨水调节pH值，正硅酸乙酯-硝酸铝-硝酸钾-乙醇溶胶在5～12min内快速形成凝胶，最佳胶凝条件为：H2O／TEOS=25，EtOH／TEOS=4，pH≈9。干凝胶在862℃晶化热处理3h制备得到纳米级钾霞石粉体。合成钾霞石粉体一次粒子粒径约50nm，团聚后的二次粒子粒径5～20μm，平均孔径11．2nm，孔径呈双峰分布，属于中孔材料，可用作催化剂助剂。A fast gelling process to synthesize kalsilite powder was performed by dropping aqua ammonia into the TEOS-KNO3- Al（NO3）3-EtOH-H20 system, which resulted in the formation of a gel in 5 -- 12 minutes. Compared with the traditional sol-gel method, the gelation time is greatly shortened. The optimum gelling conditions are as follows： molar ratio of H20 to TEOS 25, molar ratio of EtOH to TECS 4 and pH value about 9. Kalsilite powder is produced by treating the dried gel under 862℃ for 3 hours. The synthesized kalsilite particle is nearly 50 nm, and most of the secondary particles 5- 20 μm. The specific surface area of synthesized kalsilite is 26.3 m^2/g with an average intergranular pore size around 11.2 nm. The synthesized kalsilite powder is mesoporous with a bimodal pore distribution. Pure and homogeneous, stable in high temperature and with high potassium content and a bimodal pore distribution, the synthesized kalsilite powder can serve well as an efficient catalyst aid with relatively high application value.

关 键 词：钾霞石 溶胶-凝胶法 快速胶凝 氨水 

分 类 号：P578.972[天文地球—矿物学] P579[天文地球—地质学]