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Lookup NU author(s): Rouzbeh Jamei, Dr Jonathan McDonough, Dr Vladimir Zivkovic
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Author(s)Polyethylenimine (PEI)-based adsorbents exhibit high CO2 capacities, making them potential candidates for mitigating unavoidable industrial CO2 emissions. However, desorption of CO2 from PEI, and from adsorbents in general, has received far less attention in the literature than adsorption. Whilst Temperature Swing Adsorption (TSA) is simple to conceptualise, it is difficult to implement in small-scale experiments in practice. Here we study the desorption characteristics of a commercial branched PEI adsorbent in a small-scale swirling fluidised bed reactor (TORBED) to improve the small-scale heat transfer rates. Our experimental results show that higher desorption temperatures, higher gas flow rates, and higher CO2 concentrations during adsorption can improve the desorption efficiency (defined as the amount of CO2 removed as a fraction of the initial amount adsorbed). In terms of kinetics, we found that the fractional order kinetic model provided the best fit to the PEI adsorbent, implying that this adsorbent involves multiple simultaneous molecular interactions, physisorption processes, and chemisorption processes, that cannot be described by simpler pseudo 1st or 2nd order models. Desorption rates in the TORBED in this study were 1 order of magnitude faster than fluidised beds, and 2–3 orders of magnitude faster than packed beds.
Author(s): Jamei R, McDonough JR, Mobley PD, Tanthana J, Gupta V, Zivkovic V
Publication type: Article
Publication status: Published
Journal: Chemical Engineering Journal
Year: 2024
Volume: 498
Online publication date: 07/10/2024
Acceptance date: 05/09/2024
Date deposited: 24/09/2024
ISSN (print): 1385-8947
ISSN (electronic): 1873-3212
Publisher: Elsevier B.V.
URL: https://doi.org/10.1016/j.cej.2024.155568
DOI: 10.1016/j.cej.2024.155568
Data Access Statement: Data will be made available on request.
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