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Reactors, Kinetics, and Catalysis
A contact-point based approach for the analysis of reactions among solid particles
Article first published online: 29 JUN 2010
DOI: 10.1002/aic.12347
Copyright © 2010 American Institute of Chemical Engineers (AIChE)
1547-5905/asset/cover.gif?v=1&s=3d1276953963f4e484c1215cd7884fd5fbdaf6ee "AIChE Journal")
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How to Cite
Dalvi, V. V. and Suresh, A. K. (2011), A contact-point based approach for the analysis of reactions among solid particles. AIChE J., 57: 1329–1338. doi: 10.1002/aic.12347
Publication History
- Issue published online: 12 APR 2011
- Article first published online: 29 JUN 2010
- Accepted manuscript online: 29 JUN 2010 12:00AM EST
- Manuscript Revised: 27 MAY 2010
- Manuscript Received: 26 JAN 2010
- Abstract
- Article
- References
- Cited By
Keywords:
- solid-solid reactions;
- contact points;
- Hao-Tanaka model
Abstract
The contact-point framework,1 which replaces the picture of continuous contact between the reactants by contact at a finite number of points, has been proposed as a rational one for treating reactions among particulate solids. However, available models suffer from various drawbacks, the main one being that they do not show the right asymptotic behavior for large number of contact points. A model is presented here, that corrects these deficiencies. The results show that the contact-point model approaches particle-continuum behavior whenever the number of contact points exceeds 500. The model predictions have been compared with some data from our previous work on calcia-alumina system in the temperature range 1,150–1,300°C. The model fits the data well, with the fitted values of diffusivity (of calcia through alumina) being of the order of 10−16 m2/s. © 2010 American Institute of Chemical Engineers AIChE J, 2010