Macroscopic and Microscopic Effects in Diffusion and Reaction in Catalyst Porous Particles

Abstract:

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This article presents and discusses a network model to describe and predict the behaviour and performance of catalyst particles. The differences and advantages of this approach when compared to the continuous models currently used in practice are highlighted and critically assessed. The local structure of the catalyst particle is modelled using a three dimensional network model made up of cylindrical pores and nodes of negligible volume. In the pores a homogenous first-order reaction takes place, coupled with the diffusion. For steady state conditions the concentration field can be obtained solving a sparse linear system of equations, obtained by solving the mass balance equations written for the network nodes and using the concentration profile in the network pores. The influence of the boundary conditions and the network sizes was investigated, showing the results in particular that the nature of the boundary conditions can have a profound impact in the predictions of the model.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 283-286)

Edited by:

Andreas Öchsner, Graeme E. Murch and Ali Shokuhfar

Pages:

388-393

DOI:

10.4028/www.scientific.net/DDF.283-286.388

Citation:

A. Martins et al., "Macroscopic and Microscopic Effects in Diffusion and Reaction in Catalyst Porous Particles", Defect and Diffusion Forum, Vols. 283-286, pp. 388-393, 2009

Online since:

March 2009

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Price:

$35.00

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