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Microporous Alumino-Silicate Gels Synthesized by Sol-Gel Method

Published online by Cambridge University Press:  21 February 2011

L. Chu ,
G. Yaluris ,
W. A. Zeltner  and
M. A. Anderson
L. Chu
Affiliation:
Water Chemistry Program, University of Wisconsin- Madison, Wisconsin 53706
G. Yaluris
Affiliation:
Water Chemistry Program, University of Wisconsin- Madison, Wisconsin 53706
W. A. Zeltner
Affiliation:
Water Chemistry Program, University of Wisconsin- Madison, Wisconsin 53706
M. A. Anderson
Affiliation:
Water Chemistry Program, University of Wisconsin- Madison, Wisconsin 53706
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Abstract

Microporous alumino-silicate gels were prepared by the sol-gel method. The Al cations were incorporated into these systems by mixing an aluminum nitrate solution into silica water based sols under controlled pH conditions. The micro structure as well as the form of the products are influenced by the amount of Al additives. Al cations have significant effects on the properties of silica sols and gels. The alumino-silicate gel has micro porosity with surface area as high as 300 m2/g even after calcining at 900 °C for one hour. Strong negative charge is found on these alumino-silicate surfaces in aqueous solution indicating the Al cations have been substituted isomorphically into the Si sites in the framework of silica.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 481
Copyright
Copyright © Materials Research Society 1998

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References

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