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Effect of Prehydrolysis on the Textural and Catalytic Properties of Titania-Silica Aerogels*

Published online by Cambridge University Press:  15 February 2011

James B. Miller ,
Scott T. Johnston  and
Edmond I. Ko
James B. Miller
Affiliation:
Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890.
Scott T. Johnston
Affiliation:
Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890.
Edmond I. Ko
Affiliation:
Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890.
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Abstract

A sol-gel based preparation of a mixed oxide allows considerable control over the extent of component mixing. When the reactivities of the alkoxide precursors are evenly matched, a homogeneously mixed sample can be produced; a large reactivity difference results in a segregated mixed oxide product. We have prepared and characterized two sets of mixed titania-silica aerogels, each covering the entire composition range. One set was made using silicon precursor prehydrolysis to minimize the reactivity difference and promote homogeneous component mixing; the second set was made without prehydrolysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 368: Symposium T – Synthesis and Properties of Advanced Catalytic Materials , 1994 , 345
Copyright
Copyright © Materials Research Society 1995

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Footnotes

*

The work described in this extended abstract has been published elsewhere (3). We acknowledge the support of the Division of Chemical Sciences, Office of Basic Energy Sciences, U.S. Department of Energy (Grant DE-FG02-93ER14345).

References

REFERENCES

1. Liu, Z., Tabora, J., and Davis, R. J., J. Catal., 149, 117(1994).Google Scholar
2. Tanabe, K., Sumiyoshi, T., Shibata, K., Kiyoura, T., and Kitigawa, J., Bull. Chem. Soc., Jpn. 47(5), 1064 (1974).Google Scholar
3. Miller, J. B., Johnston, S. T., and Ko, E. I., J. Catal. 150, 311 (1994).Google Scholar