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

Jannis Hack, Seraina Frazzetto, Leon Evers, Nobutaka Maeda and Daniel M. Meier
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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

Energies, 2022, vol. 15, issue 3, 1-8

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.

Keywords: CO 2 capture; polyethylenimine; regeneration temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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