Velocity Variation Effect in Fixed Bed Columns: A Case Study of CO2 Capture using Porous Solid Adsorbents

Nadeen Al-Janabi, Reza Vakili, Patthadon Kalumpasut, Patricia Gorgojo, Flor Siperstein, Xiaolei Fan, Paschal McCloskey

    Research output: Contribution to journalArticlepeer-review


    This study shows that for a reliable evaluation of porous adsorbents for carbon capture based on the fixed bed adsorption analysis, one must consider the effect of velocity variation due to adsorption to make a fair judgment on predicting the performance of materials under flow conditions. A combined experimental and numerical study of CO2/N2 adsorption in fixed beds using three forms of adsorbents of amorphous powder (bulk activated carbon), crystalline powder (bulk Cu-BTC metal-organic framework, MOF) and crystalline pellets (pelleted Cu-BTC) was carried out to show the effect of velocity variation on CO2 breakthrough curves. Significant deviations are observed in the estimated amount adsorbed calculated from fixed bed experiments when models used for interpretation the measured data consider constant gas velocity because the stoichiometric time is underestimated. We show that the difference in breakthrough times estimated in models that consider constant and variable gas velocity grows exponentially with the feed gas concentration. This article is protected by copyright. All rights reserved.
    Original languageEnglish
    Pages (from-to)2189–2197
    JournalAIChE Journal
    Issue number6
    Early online date23 Feb 2018
    Publication statusPublished - 2018


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