Effect of crystallite size on the thermal phase change and porous properties of boehmite

被引：20
|
作者：
Okada, K [1 ]
Nagashima, T [1 ]
Kameshima, Y [1 ]
Yasumori, A [1 ]
机构：
[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528552, Japan
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2002年 / 248卷 / 01期
关键词：
boehmite; crystallite size; porous property; thermal phase change; thermal stability;
D O I：
10.1006/jcis.2001.8183
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of crystallite size on the thermal phase change and porous properties of boehmite was investigated using boehmites with crystallite sizes of 2.9 to 24.4 nm and boehmite gels prepared by precipitation and hydrothermal methods. The dehydroxylation temperature of boehmite increases, its phase transition temperature from gamma- to theta-Al2O3 decreases and the theta- to alpha-Al2O3 transition temperature increases as the crystallite size of the boehmite increases. Boehmite with a crystallite size of similar to5 nm shows the highest specific surface area and greatest thermal stability. This boehmite contains pores of about 2-3 nm radius, suggested to be responsible for the superior porous properties and thermal stability. (C) 2002 Elsevier Science (USA).
引用
收藏
页码：111 / 115
页数：5
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