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Processing of mesoporous alumina from a powder precursor

Published online by Cambridge University Press:  31 January 2011

J. Wayne Frazee  and
Thomas M. Harris
J. Wayne Frazee
Affiliation:
Department of Chemistry and Biochemistry, University of Tulsa, 600 South College Avenue, Tulsa, Oklahoma 74104
Thomas M. Harris*
Affiliation:
Department of Chemistry and Biochemistry, University of Tulsa, 600 South College Avenue, Tulsa, Oklahoma 74104
*
a) Address all correspondence to this author. e-mail: thomas-harris@utulsa.edu
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Abstract

Oxides with significant mesopore volume can be produced from gels through ambient pressure drying (APD) if the oxide network within the gel is sufficiently strong. To obtain a strong alumina gel, a commercial alumina powder (100 nm diameter) was combined with different amounts of ethanol, water, and acid. Significant mesoporosity was observed in dried and calcined gels prepared from this precursor and ethanol alone, particularly when “poor wettability” was established in the gel through azeotropic distillation in toluene. When water (or water and nitric acid) was also utilized the pore volume decreased dramatically; this observation may be attributed to the creation of amorphous alumina from the crystalline precursor that is displaced into the interparticle pores, and in which mesopores are poorly preserved during APD.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 11 , November 2001 , pp. 3262 - 3265
Copyright
Copyright © Materials Research Society 2001

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References

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