We propose a kinetic model for the transformation of nanosized amorphous TiO2 to anatase with associated coarsening by coalescence. Based on population balance (distribution kinetics) equations for the size distributions, the model applies a firstorder rate expression for transformation combined with Smoluchowski coalescence for the coarsening particles. Size distribution moments (number and mass of particles) lead to dynamic expressions for extent of reaction and average anatase particle diameter, which are compared with experimental data [Chem. Mater. 2002, 14, 4145]. Data at different temperatures yield activation energies for coalescence and transformation rate coefficients, as well as an overall endothermic transformation energy for combined transformation and dehydration. © 2007 American Chemical Society.

Giridhar Madras

Department of Chemical Engineering

B.J. McCoy

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Journal	Crystal Growth and Design
ISSN	15287483