Kinetics of CeO<sub>2</sub>, surface area reduction in a mixture of HCl, H<sub>2</sub>O, and O<sub>2</sub> - Mines Saint-Étienne Access content directly
Journal Articles Journal of the American Ceramic Society Year : 1992

Kinetics of CeO2, surface area reduction in a mixture of HCl, H2O, and O2

Abstract

Surface area reduction of a cerium dioxide powder is studied at 900 K in a HCl, H2O, and O2 atmosphere. The rate of surface area decrease 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 hygrogen 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 ceriumdioxide particles.
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Dates and versions

emse-00612871 , version 1 (01-08-2011)

Identifiers

  • HAL Id : emse-00612871 , version 1

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Frédéric Gruy, Michèle Pijolat. Kinetics of CeO2, surface area reduction in a mixture of HCl, H2O, and O2. Journal of the American Ceramic Society, 1992, 77 (6), pp.1537-1544. ⟨emse-00612871⟩
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