An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using Molecular Sieve Silica (MSS) membrane reactors

Battersby, Scott, Teixeira, Paula Werneck, Beltramini, Jorge, Duke, Mikel C., Rudolph, Victor and Diniz da Costa, João C. (2006) An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using Molecular Sieve Silica (MSS) membrane reactors. Catalysis Today, 116 1: 12-17.


Author Battersby, Scott
Teixeira, Paula Werneck
Beltramini, Jorge
Duke, Mikel C.
Rudolph, Victor
Diniz da Costa, João C.
Title An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using Molecular Sieve Silica (MSS) membrane reactors
Journal name Catalysis Today   Check publisher's open access policy
ISSN 0920-5861
Publication date 2006-07-30
Sub-type Article (original research)
DOI 10.1016/j.cattod.2006.04.004
Volume 116
Issue 1
Start page 12
End page 17
Total pages 6
Editor Julian R H Ross
Place of publication Netherlands
Publisher Elsevier Science BV
Collection year 2006
Language eng
Subject 290603 Membrane and Separation Technologies
C1
670701 Industrial gases
Abstract The use of membrane reactors in industrial processes leads to high efficiencies because the reaction equilibrium can be shifted towards high conversion and product formation. In addition, the combination of reaction and separation in a single unit operation leads to process simplification and probably hardware cost reduction. A key design factor for membrane reactors is the ratio of maximum reaction rate per volume over maximum permeation rate per volume, characterised by the product of Damkohler and Peclet numbers (DaPe). The smaller the DaPe number, the more effective the membrane reactor becomes. Using a membrane bed reactor with molecular sieve silica (MSS) membranes and the dehydrogenation of cyclohexane to benzene as the test reaction, we observe that cyclohexane conversion rates increased from 3% to 20% as the DaPe reduced from 80 to 1. The conversion is well predicted by a simple equilibrium model. The DaPe number provides a simple measure of the interaction of the reaction and separation effects and a method to evaluate the membrane reactor efficiency to optimise the design.
Keyword Damkohler and Peclet numbers
Molecular sieve silica
Membrane reactors
Modelling
Cyclohexane
Dehydrogenation
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Created: Wed, 03 Jan 2007, 09:40:35 EST by Dr Mikel Duke on behalf of School of Mathematics & Physics