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A Coffee-Based Bioadsorbent for CO 2 Capture from Flue Gas Using VSA: TG-Vacuum Tests

Author

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  • Marcelina Sołtysik

    (Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland)

  • Izabela Majchrzak-Kucęba

    (Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland)

  • Dariusz Wawrzyńczak

    (Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland)

Abstract

In the energy sector and in other types of industries (cement, iron/steel, chemical and petrochemical), highly roasted coffee ground residue can be used as a source material for producing bioadsorbents suitable for CO 2 capture. In this study, a bioadsorbent was produced in a two-step process involving biowaste carbonization and biocarbon activation within a KOH solution. The physicochemical properties of the bioadsorbent were assessed using LECO, TG, SEM, BET and FT-IR methods. Investigating the CO 2 , O 2 and N 2 equilibrium adsorption capacity using an IGA analyzer allowed us to calculate CO 2 selectivity factors. We assessed the influence of exhaust gas carbon dioxide concentration (16%, 30%, 81.5% and 100% vol.) and adsorption step temperature (25 °C, 50 °C and 75 °C) on the CO 2 adsorption capacity of the bioadsorbent. We also investigated its stability and regenerability in multi-step adsorption–desorption using a TG-Vacuum system, simulating the VSA process and applying different pressures in the regeneration step (30, 60 and 100 mbar abs ). The tests conducted assessed the possibility of using a produced bioadsorbent for capturing CO 2 using the VSA technique.

Suggested Citation

  • Marcelina Sołtysik & Izabela Majchrzak-Kucęba & Dariusz Wawrzyńczak, 2025. "A Coffee-Based Bioadsorbent for CO 2 Capture from Flue Gas Using VSA: TG-Vacuum Tests," Energies, MDPI, vol. 18(15), pages 1-23, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:3965-:d:1709287
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    References listed on IDEAS

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    1. Plaza, M.G. & González, A.S. & Pevida, C. & Pis, J.J. & Rubiera, F., 2012. "Valorisation of spent coffee grounds as CO2 adsorbents for postcombustion capture applications," Applied Energy, Elsevier, vol. 99(C), pages 272-279.
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