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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Branched versus linear structure : lowering the CO2 desorption temperature of polyethylenimine-functionalized silica adsorbents
Authors: Hack, Jannis
Frazzetto, Seraina
Evers, Leon
Maeda, Nobutaka
Meier, Daniel M.
et. al: No
DOI: 10.3390/en15031075
Published in: Energies
Volume(Issue): 15
Issue: 3
Page(s): 1075
Issue Date: 2022
Publisher / Ed. Institution: MDPI
ISSN: 1996-1073
Language: English
Subjects: CO2-capture; Regeneration temperature; Polyethylenimine
Subject (DDC): 660: Chemical engineering
Abstract: Lowering the regeneration temperature for solid CO2‐capture materials is one of the critical tasks for economizing CO2‐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 CO2 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 CO2 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 CO2‐capturing system, the low regeneration temperature makes LPEI attractive for industrial applications.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Appears in collections:Publikationen School of Engineering

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