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Modeling of Gas‐Solid Reactions: Kinetics, Mass and Heat Transfer, and Evolution of the Pore Structure
Author(s) -
Patisson F.,
Ablitzer D.
Publication year - 2000
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/(sici)1521-4125(200001)23:1<75::aid-ceat75>3.0.co;2-v
Subject(s) - mass transfer , exothermic reaction , heat transfer , chemical reaction , chemistry , thermodynamics , chemical kinetics , kinetics , diffusion , porosity , transport phenomena , chemical engineering , porous medium , organic chemistry , chromatography , physics , quantum mechanics , engineering
Mathematical models for simulating heterogeneous gas‐solid reactions must describe a complex set of physicochemical and thermal phenomena. These include the chemical reaction itself, at an interface whose area varies during the conversion, the transport of gaseous species by diffusion in the pores of the solid, whose size and number generally change in the course of reaction, diffusional transport in the layer of solid product, the evolution or consumption of heat by the reaction and its transport in the porous solid, etc. The present paper gives details of the equations employed to model each of these processes. Some computed results illustrate how increasingly sophisticated recent models describe the gradual obstruction of pores during reactions, such as the sulfation of lime, or the thermal effects related to the exothermic nature of the oxidation of zinc sulfide.