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Branched versus Linear Structure: Lowering the CO 2 Desorption Temperature of Polyethylenimine-Functionalized Silica Adsorbents

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  • Jannis Hack

    (Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, Switzerland)

  • Seraina Frazzetto

    (Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, Switzerland)

  • Leon Evers

    (Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, Switzerland)

  • Nobutaka Maeda

    (Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, Switzerland)

  • Daniel M. Meier

    (Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), CH-8400 Winterthur, Switzerland)

Abstract

Lowering the regeneration temperature for solid CO 2 -capture materials is one of the critical tasks for economizing CO 2 -capturing processes. Based on reported pKa values and nucleophilicity, we compared two different polyethylenimines (PEIs): branched PEI (BPEI) and linear PEI (LPEI). LPEI outperformed BPEI in terms of adsorption and desorption properties. Because LPEI is a solid below 73–75 °C, even a high loading amount of LPEI can effectively adsorb CO 2 without diffusive barriers. Temperature-programmed desorption (TPD) demonstrated that the desorption peak top dropped to 50.8 °C for LPEI, compared to 78.0 °C for BPEI. We also revisited the classical adsorption model of CO 2 on secondary amines by using in situ modulation excitation IR spectroscopy, and proposed a new adsorption configuration, R1(R2)-NCOOH. Even though LPEI is more expensive than BPEI, considering the long-term operation of a CO 2 -capturing system, the low regeneration temperature makes LPEI attractive for industrial applications.

Suggested Citation

  • Jannis Hack & Seraina Frazzetto & Leon Evers & Nobutaka Maeda & Daniel M. Meier, 2022. "Branched versus Linear Structure: Lowering the CO 2 Desorption Temperature of Polyethylenimine-Functionalized Silica Adsorbents," Energies, MDPI, vol. 15(3), pages 1-8, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1075-:d:739692
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    References listed on IDEAS

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    1. Yoro, Kelvin O. & Daramola, Michael O. & Sekoai, Patrick T. & Armah, Edward K. & Wilson, Uwemedimo N., 2021. "Advances and emerging techniques for energy recovery during absorptive CO2 capture: A review of process and non-process integration-based strategies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 147(C).
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