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An intrinsic-transport model for solid-solid reactions involving a gaseous intermediate

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An Erratum to this article was published on 01 June 1988

Abstract

A model has been developed for solid state reactions between powders in pellets or beds of reacting mixtures where the rate-limiting step is diffusion of a gaseous intermediate within the pore space (called intrinsic-transport). The basis of the model is a network of expanding reaction cells, each centered on a particle of the reactant which gives rise to the gaseous intermediate. The partial pressure of the intermediate decreases from the equilibrium value at the surface of the central particle to zero effectively at the reaction front of the cell due to reaction with the other solid reactant within the cell volume. The rate constant for an intrinsic transport controlled reaction is relatable to physical properties of the system, and it is shown that a partial pressure of the intermediate of the order of only 10-4 to 10-10 atm is sufficient to sustain solid state reactions at commonly observed rates.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Waterloo, 2L 3G1, Waterloo, ON, Canada

    J. R. Wynnyckyj (Professor)

  2. IRO Division of Mineral Engineering, 3168, Clayton, Victoria, Australia

    W. J. Rsukin (Principal Research Scientist)

Authors
  1. J. R. Wynnyckyj
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  2. W. J. Rsukin
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Additional information

An erratum to this article is available at http://dx.doi.org/10.1007/BF02657756.

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Wynnyckyj, J.R., Rsukin, W.J. An intrinsic-transport model for solid-solid reactions involving a gaseous intermediate. Metall Trans B 19, 73–81 (1988). https://doi.org/10.1007/BF02666493

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  • DOI: https://doi.org/10.1007/BF02666493

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