DOI: https://doi.org/10.61435/ijred.2025.61222

Advanced one-dimensional heterogeneous model for high temperature water gas shift membrane reactors

1Laboratory of Process Engineering, Computer Science and Mathematics, Department of Process Engineering (LIPIM), National School of Applied Sciences of Khouribga, Sultan Moulay Slimane University, Bd Béni Amir, BP 77, 25000, Khouribga, Morocco

2Laboratory of Materials, Processes, Environment and Quality (LMPEQ), National School of Applied Sciences of Safi, Cadi Ayyad University, Route Sidi Bouzid BP 63, 46000 Safi, Morocco

Received: 17 Mar 2025; Revised: 15 Jun 2025; Accepted: 10 Jul 2025; Available online: 16 Jul 2025; Published: 1 Sep 2025.
Editor(s): H Hadiyanto
Open Access Copyright (c) 2025 The Author(s). Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract

To predict the behavior of small-scale WGS membrane reactors, a new model based on the 1D heterogeneous approach was developed. Unlike most studies, which rely on 1D pseudo-homogeneous models—typically limited to reactors filled with small catalyst particles which are prone to misestimating catalytic effectiveness when larger catalyst grains are used in which mass transfer resistance is usually considered only within the dense membrane layer which a valid assumption only when this layer is thick, the proposed model adapts to a wide range of catalyst sizes and geometries and also accounts for resistance in the porous stainless steel support of the membrane. This makes it suitable when the dense layer is thin.Comparison with experimental data under various conditions validated the model’s ability to predict the behavior of reactors packed with large catalyst particles (Vgrain ≈ 169 mm³). Therefore, the developed 1D heterogeneous model accurately predicts membrane reactor behavior without resorting to more complex 2D models. Simulations highlighted the significant influence of particle geometry on the catalyst effectiveness factor throughout the reactor, while its impact on carbon monoxide conversion, hydrogen partial pressure, and the temperature profile is especially pronounced near the reactor inlet. Additionally, results showed that sweep gas use accelerates the reaction and aids hydrogen permeation. Finally, CO conversion in the membrane reactor reached 1.3 times that of a conventional fixed-bed reactor.

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Keywords: Catalyst geometry; effectiveness factor; membrane reactor; permeate zone; sweep gas

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Section: Original Research Article
Language : EN
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