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Vapor phase synthesis of Al-doped titania powders

Published online by Cambridge University Press:  03 March 2011

Kamal M. Akhtar ,
Sotiris E. Pratsinis  and
Sebastian V.R. Mastrangelo
Kamal M. Akhtar
Affiliation:
Department of Chemical Engineering, Center for Aerosol Processes, University of Cincinnati, Cincinnati, Ohio 45221-0171
Sotiris E. Pratsinis*
Affiliation:
Department of Chemical Engineering, Center for Aerosol Processes, University of Cincinnati, Cincinnati, Ohio 45221-0171
Sebastian V.R. Mastrangelo
Affiliation:
DuPont Chemicals, Edge Moor, Delaware 19809
*
a)Author to whom correspondence should be addressed.
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Abstract

The role of aluminum as dopant in gas phase synthesis of titania powders was experimentally investigated in an aerosol flow reactor between 1300 and 1700 K. Titania was produced by vapor phase oxidation of titanium tetrachloride in the presence of dopant aluminum trichloride vapor. The presence of aluminum altered the particle morphology from polyhedral to irregular crystals. Energy dispersive analysis and transmission electron microscopy indicated that the powders were mixtures of crystalline titania and amorphous alumina. Analysis by XPS indicated significant enrichment of aluminum on the particle surface. Some aluminum titanate (up to 17% by volume) was formed at 1700 K when a high concentration of AlCl3 was used (AlCl3/TiCl4 ≥ 0.07). Measurements of lattice parameters by x-ray diffraction indicated that aluminum formed a solid solution in titania. While titania synthesized in the absence of aluminum was about 90% anatase, the introduction of aluminum resulted in pure rutile at AlCl3/TiCl4 = 0.07. The effects of aluminum on titania phase composition and morphology are explained by the creation of oxygen vacancies in the titania crystallites and by the enhancement of the sintring rate of titania grains.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1241 - 1249
Copyright
Copyright © Materials Research Society 1994

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