Effect of preparation conditions on the porous properties of coprecipitated Al2O3-SiO2 xerogels synthesized from aluminium nitrate nonahydrate and tetraethylorthosilicate

Kiyoshi Okada, Takahiro Tomita, Yoshikazu Kameshima, Atsuo Yasumori, Toyohiko Yano, Kenneth J.D. MacKenzie

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Amorphous aluminosilicate xerogels of 9.4 mol% (15 mass%) Al2O3 composition were prepared by coprecipitation under various preparation conditions to investigate their effect on the porous properties of the xerogels. The precipitates were synthesized by coprecipitation of an ethanol solution of aluminium nitrate nonahydrate (ANN) and tetraethylorthosilicate (TEOS) using conc. NH4OH as the precipitant. The xerogels were obtained by drying and calcining the precipitate at 300°C for 4 h. Various synthesis conditions were tried, such as changes in the precipitation method, concentration of total (ANN + TEOS), H2O/TEOS ratio, the mixing time of the ANN and TEOS solutions, and the amount of NH4OH added. Of these experimental parameters, the H2O/TEOS ratio and mixing time of the ANN and TEOS solutions exerted the greatest influence on the porous properties. The specific surface area, total pore volume and pore radius of the xerogels ranged from 123 to 455 m2 g-1, from 0.31 to 1.17 ml g-1 and from 1.8 to 20 nm, respectively. These porous properties could readily be controlled by controlling the preparation conditions of the xerogels. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)355-364
Number of pages10
JournalMicroporous and Mesoporous Materials
Issue number3
Publication statusPublished - Jun 1 2000
Externally publishedYes



  • Aluminosilicate xerogel
  • Porous properties
  • Preparation condition
  • Rapid coprecipitation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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