Preparation of porous silica from mechanically activated kaolinite

被引:68
|
作者
Temuujin, J [1 ]
Burmaa, G
Amgalan, J
Okada, K
Jadambaa, T
MacKenzie, KJD
机构
[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Tokyo 1528552, Japan
[2] Mongolian Acad Sci, Inst Chem & Chem Technol, Ulaanbaatar 51, Mongolia
[3] Mongolian Tech Univ, Dept Chem Technol, Ulaanbaatar 46, Mongolia
[4] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
基金
日本学术振兴会;
关键词
grinding; kaolinite; leaching; porous silica;
D O I
10.1023/A:1012244924490
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Mesoporous silica has been prepared by leaching of the Al2O3 component from mechanically amorphized kaolinite. The kaolinite was amorphized by grinding in a planetary ball mill for 1 h. After grinding the amorphized kaolinite was chemically treated with dilute sulfuric acid at 90 degreesC for varying times. The influence of the leaching time on the porous properties and structure of the silica was studied by XRD, XRF, FTIR and BET adsorption methods. The specific surface areas of the leached samples were found to vary from 312 m(2)/g to 284 m(2)/g. The pore size distribution, calculated by the BJH method based on N-2 gas isotherms, showed a unimodal pore size distribution with an average pore size of about 3.8 nm. The total pore volume of the porous silica varied from 0.28 ml/g to 0.312 ml/g, with a uniform pore size distribution in the mesopore regions. New applications exploiting the characteristic pore size of this material are to be expected.
引用
收藏
页码:233 / 238
页数:6
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