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Simplified method for effectiveness factor calculations in irregular geometries of washcoats
KTH, Superseded Departments, Numerical Analysis and Computer Science, NADA.
2000 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 55, no 8, 1447-1459 p.Article in journal (Refereed) Published
Abstract [en]

A simplified method to calculate the effectiveness factors in irregular geometries of washcoats is presented. The method is based on sectioning the washcoat into particles and treating each particle in a 1D approach. This simplified method was compared with a rigorous 2D model for different kinds of geometrical shapes and kinetic expressions of the washcoat. For a first- and 0.75th-order reaction, the simplified method showed a good agreement with the 2D model. For a Langmuir-Hinshelwood rate expression, giving effectiveness factors higher than one, the simplified method could give rise to errors up to 14% due to inhibition effects. However, this was only significant at intermediate Values of temperatures and high surface concentrations on the washcoat. In general, the simplified method gives a good a priori estimation of the effectiveness factor that can replace tedious and time-consuming finite element calculations in irregular shapes of washcoats. A comparison of the CPU-time required to solve a 2D-reactor model has been conducted for the different approaches to evaluate the effectiveness factor.

Place, publisher, year, edition, pages
2000. Vol. 55, no 8, 1447-1459 p.
Keyword [en]
effectiveness factor, irregular shapes, washcoats, mixture of sizes, monolith, catalysts, models
URN: urn:nbn:se:kth:diva-19487ISI: 000084770500008OAI: diva2:338179

QC 20100525

Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2014-09-24Bibliographically approved

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Edsberg, Lennart
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