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Effect of Crystallite Size on the Thermal Phase Change and Porous Properties of Boehmite

✍ Scribed by Kiyoshi Okada; Toru Nagashima; Yoshikazu Kameshima; Atsuo Yasumori

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 111 KB
Volume: 248
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2001.8183

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✦ Synopsis

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-Al(2)O(3) decreases and the theta- to alpha-Al(2)O(3) transition temperature increases as the crystallite size of the boehmite increases. Boehmite with a crystallite size of approximately 5 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.

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