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Porous Spheroidal Hydrotalcite Aggregates

  • Sherman D. Cox (a1) and Kenneth J. WISE (a1)

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.

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1. Reichle, W. T., Solid State Ionics 22, 135 (1986); Chemntech Jan. 1986, 58; for an extensive review, see F. Cavani, F. Trifiro and A. Vaccari, Cat. Today 11, 173 (1991).
2. (a) Loughbrough, R., Ind. Minerals, October 1991, 2135; (b) Meisinger, A. C., in Mineral Facts and Problems, (U. S. Bureau of Mines, 1980), p. 651.
3. Kagunya, W. and Jones, W., NATO ASI Ser., Ser. C, (Multifunctional Mesoporous Inorganic Solids) 400, 217 (1993).

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Porous Spheroidal Hydrotalcite Aggregates

  • Sherman D. Cox (a1) and Kenneth J. WISE (a1)

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