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Alumina aerogel catalysts prepared by two supercritical drying methods used in methane combustion

Published online by Cambridge University Press:  03 March 2011

Yasuyuki Mizushima  and
Makoto Hori
Yasuyuki Mizushima*
Affiliation:
Colloid Research Institute, 350–1 Ogura, Yahatahigashi-ku, Kitakyushu 805, Japan
Makoto Hori*
Affiliation:
Colloid Research Institute, 350–1 Ogura, Yahatahigashi-ku, Kitakyushu 805, Japan
*
a)Present address: Nagoya Division, Superconductivity Research Laboratory, International Superconductivity Technology Center, (c/o) Japan Fine Ceramic Center, 4–1 Mutsuno, 2-Chome, Atsuta-ku, Nagoya 456, Japan.
b)Present address: Kurosaki Refractories Co., Ltd., 1–1, Higashihama, Yawata-nishi, Kitakyushu 806, Japan.
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Abstract

Palladium-supported alumina aerogels were prepared by two different supercritical drying methods. In one method, an alumina wet gel was dried under supercritical conditions of ethanol in an autoclave. In the other, the aerogel was supercritically dried by extracting ethanol using carbon dioxide in an extractor. The Pd-supported alumina aerogel prepared in the autoclave exhibited a high specific surface area of 112.8 m2/g after firing at 1200 °C for 5 h, while the other had a specific surface area of only 5.2 m2/g due to α-alumina transformation. Their catalytic properties for methane combustion were measured. The Pd-supported alumina aerogel prepared in the autoclave combusts methane perfectly at 50–60 °C lower temperature than the other. Palladium particles on the alumina aerogel prepared in the autoclave contained palladium oxide, while those prepared in the CO2 extractor contained only palladium metal.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 6 , June 1995 , pp. 1424 - 1428
Copyright
Copyright © Materials Research Society 1995

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