Kinetics of Anatase TiO2Surface Area Reduction in a Mixture of HCI, H2O, and O2: II, Quantitative Modeling
作者:
Frédéric Gruy,
Michèle Pijolat,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 3
页码: 663-666
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb07856.x
出版商: Blackwell Publishing Ltd
关键词: anatase;surface area;kinetics;modeling;water
数据来源: WILEY
摘要:
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)2Cl2in 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 spec
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