A generalized kinetic model for heterogeneous gas-solid reactions

Zhijie Xu, Xin Sun, Mohammad A. Khaleel

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We present a generalized kinetic model for gas-solid heterogeneous reactions taking place at the interface between two phases. The model studies the reaction kinetics by taking into account the reactions at the interface, as well as the transport process within the product layer. The standard unreacted shrinking core model relies on the assumption of quasi-static diffusion that results in a steady-state concentration profile of gas reactant in the product layer. By relaxing this assumption and resolving the entire problem, general solutions can be obtained for reaction kinetics, including the reaction front velocity and the conversion (volume fraction of reacted solid). The unreacted shrinking core model is shown to be accurate and in agreement with the generalized model for slow reaction (or fast diffusion), low concentration of gas reactant, and small solid size. Otherwise, a generalized kinetic model should be used.

Original languageEnglish
Article number074702
JournalJournal of Chemical Physics
Volume137
Issue number7
DOIs
Publication statusPublished - 21 Aug 2012
Externally publishedYes

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Gases
Kinetics
kinetics
gases
Reaction kinetics
reaction kinetics
products
low concentrations
Volume fraction
profiles

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

A generalized kinetic model for heterogeneous gas-solid reactions. / Xu, Zhijie; Sun, Xin; Khaleel, Mohammad A.

In: Journal of Chemical Physics, Vol. 137, No. 7, 074702, 21.08.2012.

Research output: Contribution to journalArticle

Xu, Zhijie ; Sun, Xin ; Khaleel, Mohammad A. / A generalized kinetic model for heterogeneous gas-solid reactions. In: Journal of Chemical Physics. 2012 ; Vol. 137, No. 7.
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