Approximate expression for the effectiveness factor estimation and a simple numerical method for concentration profile calculation in porous catalyst [An article from: Chemical Engineering Journal]

This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
The model of steady state diffusion and reaction in a catalyst pellet where a single reaction takes place is analyzed with the scope to predict effectiveness factor through a very simple and practical procedure. Non-linear usual reaction kinetics are used to investigate the agreement among exact or numerical predictions with approximate results. In all cases studied maximum deviations in the whole range of @f values are below 4% which turns the procedure attractive and useful. To perform numerical integration of the classical non-linear diffusion and reaction differential equation a new procedure was used that avoid usual instabilities or the introduction of spline collocation methods when concentration profiles are very steep. Concentration resulting profiles are compared with those generated by an early expression proposed by the authors.