Kinetics of Anatase TiO2 Surface Area Reduction in a Mixture of HCI, H2O, and O2: II, Quantitative Modeling

Frédéric Gruy 1, 2 Michèle Pijolat 2, 1
1 ProcESS-ENSMSE - Département Procédés et évolution des systèmes avec solides
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
Abstract : From the experimental rate for surface area reduction of anatase TiO2, expressed versus the partial pressure in H2O and the surface content of chloride ion, a kinetic model is proposed in which two parallel mechanisms are involved. Two ways of material transport appear to contribute to the surface area loss: in the vapor phase and at the surface of the oxide. The related rate-determining steps are attributed to the formation of the volatile compound Ti(OH)2Cl2 in the first case, and to the diffusion of hydroxyl ions in the second one. At high partial pressure of water, the rate is enhanced by surface interactions between water molecules and chlorine-containing species.
Keywords : anatase TiO2 surface area kinetics modeling water
Type de document :
Article dans une revue
Journal of the American Ceramic Society, Wiley, 1992, 75 (3), pp.663-666. 〈10.1111/j.1151-2916.1992.tb07856.x〉
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https://hal-emse.ccsd.cnrs.fr/emse-00610440
Contributeur : Andrée-Aimée Toucas <>
Soumis le : vendredi 22 juillet 2011 - 09:21:10
Dernière modification le : mardi 23 octobre 2018 - 14:36:05

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Frédéric Gruy, Michèle Pijolat. Kinetics of Anatase TiO2 Surface Area Reduction in a Mixture of HCI, H2O, and O2: II, Quantitative Modeling. Journal of the American Ceramic Society, Wiley, 1992, 75 (3), pp.663-666. 〈10.1111/j.1151-2916.1992.tb07856.x〉. 〈emse-00610440〉

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