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Operation of a perfusive catalytic membrane with nonlinear kinetics

Lopes, J.P. and Alves, M.A. and Oliveira, Monica and Cardoso, S.S.S. and Rodrigues, A.E. (2013) Operation of a perfusive catalytic membrane with nonlinear kinetics. Chemical Engineering Journal, 232. pp. 192-212. ISSN 1385-8947

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Abstract

Operation of a perfusive catalytic curved membrane is systematized into different transport-reaction regimes. The internal viscous permeation improves the catalyst performance, measured here by the effectiveness factor and by its enhancement relative to purely diffusive conditions. A theoretical analysis is presented for nonlinear kinetic expressions, which are suitable to describe the consumption of a reactant in many (bio)catalytic systems. The kinetic and transport parameters required to attain maximum enhancement are related by simple design rules, which depend on the form of the reaction rate law (namely on the order of reaction and dimensionless inhibition constant). For zero-order reactions, these optimum conditions correspond to attaining negligible concentration at a position inside the membrane, while may be interpreted in general as separating situations of severe mass transfer resistance from cases of high effectiveness. It is important to incorporate the correct form of the kinetic expression in the analysis, so that the predictions can be used in a quantitative manner. The results for the different regimes are compiled in enhancement plots and in Peclet–Thiele diagrams. Moreover, the study also yielded new results for the nonlinear reaction–diffusion problem in a curved membrane with its two surfaces exposed to different concentrations, a case of relevance in membrane reactors.

Item type: Article
ID code: 46670
Keywords: membrane, effectiveness factor, Michaelis-Menten, viscous flow, perfusive bioreactor, Mechanical engineering and machinery, Chemical engineering, Mechanical Engineering, Bioengineering, Catalysis, Fluid Flow and Transfer Processes
Subjects: Technology > Mechanical engineering and machinery
Technology > Chemical engineering
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and Manufacturing
Depositing user: Pure Administrator
Date deposited: 13 Feb 2014 11:20
Last modified: 23 Sep 2018 04:31
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URI: https://strathprints.strath.ac.uk/id/eprint/46670
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