Revisiting shrinking particle and product layer models for fluid–solid reactions – from ideal surfaces to real surfaces

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Tapio Salmi, Henrik Grénman, Johan Wärnå, Dmitry Yu. Murzin
Publisher: Elsevier
Publication year: 2011
Journal: Chemical Engineering and Processing
Journal acronym: Chem. Eng. Process.
Volume number: 50
Issue number: 10
Start page: 1076
End page: 1084
Number of pages: 9
ISSN: 0255-2701
eISSN: 1873-3204


A general model based on an arbitrary geometry was developed for reactive solid particles which have surface defects and porosity. The model equations comprising intrinsic kinetics as well as mass transfer effects through the product layer and the fluid film surrounding the solid particle were derived for shrinking particle and product layer models. From the model equations, the fluid (gas or liquid) concentrations at the reaction surface can be calculated and the change of the solid phase can be predicted. The approach was illustrated with monodisperse particle distributions in batch reactors. Complex kinetics as well as simpler special cases were treated. In general, the model predicts a higher reaction order with respect to the solid component than the previous ideal models, which assume slab, cylindrical or spherical geometries for solid particles.


Fluid-solid kinetics, Porous solids, Rough surfaces

Last updated on 2020-12-08 at 05:39