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Kinetics of CeO 2 Surface Area Reduction in a Mixture of HCI, H 2 O, and O 2
Author(s) -
Gruy Frédéric,
Pijolat Michèle
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb09754.x
Subject(s) - cerium , chloride , adsorption , inorganic chemistry , chemistry , hydrogen chloride , chlorine , hydrogen , diffusion , ion , partial pressure , oxygen , organic chemistry , physics , thermodynamics
Surface area reduction of a cerium dioxide powder is studied at 900 K in a HCI, H 2 O, and O 2 atmosphere. The rate of surface area decrease is determined as a function of the surface chloride content and of the partial pressure of hydrogen chloride. It is shown that particle growth occurs due to the surface diffusion of cerium and hydroxyl ions, which results from hydrogen chloride adsorption. Adsorbed chloride ions react to give gaseous chlorine. The rate‐determining step of the process of initial coarsening is hydrogen chloride fixation at the surface of cerium dioxide particles.