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Porous Spheroidal Hydrotalcite Aggregates

Published online by Cambridge University Press:  28 February 2011

Sherman D. Cox  and
Kenneth J. WISE
Sherman D. Cox
Affiliation:
Specialty Minerals Inc., 9 Highland Ave., Bethlehem, PA 18017
Kenneth J. WISE
Affiliation:
Specialty Minerals Inc., 9 Highland Ave., Bethlehem, PA 18017
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Abstract

Controlled precipitation conditions allow the formation of highly porous, spheroidal aggregates of hydrotalcite. The aggregate structure resembles a house-of-cards, being composed of interconnected thin plates. The aggregate size can vary over a range of about 1 to 60 μm by altering precipitation conditions such as mixing shear, temperature, addition rates and addition order. These materials are low in bulk density and highly absorptive. The aggregate structure is maintained during calcination. The micro and meso-pore size distribution is very similar to conventionally prepared hydrotalcite, but the macroporosity is dominated by the voids between spheroids. The characteristics of these aggregates point to potential applications in areas such as catalysis and separation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 371: Symposium W1 – Advances in Porous Materials , 1994 , 151
Copyright
Copyright © Materials Research Society 1995

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References

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