Synthesis of thermally stable, high surface area anatase-alumina mixed oxides

S. Rajesh Kumar, Suresh C. Pillai, U. S. Hareesh, P. Mukundan, K. G.K. Warrier

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Mixed oxides containing anatase and 5-20 mol% alumina have been synthesized from a precursor sol containing acetic acid modified titanium isopropoxide and boehmite (AlOOH). The resultant oxides retain considerable anatase phase at 1000 °C and have specific surface area many times higher than that of pure titania. A composite precursor containing titania-20 mol% alumina after calcination at 450 °C, has a specific surface area as high as 318 m2/g compared to a value of 100 m2/g for pure titania prepared under identical conditions. The uniform dispersion of the nanoparticles of alumina in the titania gel matrix causes reduction in the anatase/anatase contact points and thus results in a decrease of nucleation sites leading to increase in thermal stability of anatase phase. The high surface area and porosity could arise from the highly branched acetate polymeric gel. The sintered density of compacts derived from mixed oxides is also brought down considerably compared to pure titania counter parts.

Original languageEnglish
Pages (from-to)286-290
Number of pages5
JournalMaterials Letters
Volume43
Issue number5
DOIs
Publication statusPublished - May 2000
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this