Critical factors in the production of sol-gel derived porous alumina

R. B. Bagwell, G. L. Messing

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

The development of porosity in sol-gel derived alumina is dependent on the phase transformations, chemistry, and other characteristics of the alumina precursor. The transformations of the aluminum hydroxides are particularly useful for designing a porous alumina with specific pore size, shape, distribution, and surface area. Dehydration results in the formation of transition aluminas with surface areas of several hundred m2/g and a distribution of intracrystalline micropores and intercrystalline mesopores. Coarsening of the transition alumina crystals and the topotactic transformations between transition aluminas lead to pore coarsening and a loss of surface area with further heating. The reconstructive transformation to α-Al2O3 replaces the micropores and mesopores of the transition aluminas with a distribution of interconnected macropores, resulting in surface areas of a few m2/g. The development and thermal stability of porosity is influenced by the precursor processing conditions, additives, and the calcination environment. Understanding and controlling the factors that influence the porosity and surface area is critical to the preparation and use of porous alumina.

Original languageEnglish (US)
Pages (from-to)45-64
Number of pages20
JournalKey Engineering Materials
Volume115
StatePublished - Dec 1 1996

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Aluminum Oxide
Sol-gels
Alumina
Porosity
Coarsening
Aluminum Hydroxide
Hydrated alumina
Dehydration
Calcination
Pore size
Thermodynamic stability
Phase transitions
Heating
Crystals
Processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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Critical factors in the production of sol-gel derived porous alumina. / Bagwell, R. B.; Messing, G. L.

In: Key Engineering Materials, Vol. 115, 01.12.1996, p. 45-64.

Research output: Contribution to journalArticle

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AB - The development of porosity in sol-gel derived alumina is dependent on the phase transformations, chemistry, and other characteristics of the alumina precursor. The transformations of the aluminum hydroxides are particularly useful for designing a porous alumina with specific pore size, shape, distribution, and surface area. Dehydration results in the formation of transition aluminas with surface areas of several hundred m2/g and a distribution of intracrystalline micropores and intercrystalline mesopores. Coarsening of the transition alumina crystals and the topotactic transformations between transition aluminas lead to pore coarsening and a loss of surface area with further heating. The reconstructive transformation to α-Al2O3 replaces the micropores and mesopores of the transition aluminas with a distribution of interconnected macropores, resulting in surface areas of a few m2/g. The development and thermal stability of porosity is influenced by the precursor processing conditions, additives, and the calcination environment. Understanding and controlling the factors that influence the porosity and surface area is critical to the preparation and use of porous alumina.

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