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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|
Meier, Daniel M.
|Publisher / Ed. Institution:||MDPI|
|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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|2022_Hack-etal_Branched-vs-linear-structure-silica-adsorbents_Energies.pdf||1.18 MB||Adobe PDF|
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Hack, J., Frazzetto, S., Evers, L., Maeda, N., & Meier, D. M. (2022). Branched versus linear structure : lowering the CO2 desorption temperature of polyethylenimine-functionalized silica adsorbents. Energies, 15(3), 1075. https://doi.org/10.3390/en15031075
Hack, J. et al. (2022) ‘Branched versus linear structure : lowering the CO2 desorption temperature of polyethylenimine-functionalized silica adsorbents’, Energies, 15(3), p. 1075. Available at: https://doi.org/10.3390/en15031075.
J. Hack, S. Frazzetto, L. Evers, N. Maeda, and D. M. Meier, “Branched versus linear structure : lowering the CO2 desorption temperature of polyethylenimine-functionalized silica adsorbents,” Energies, vol. 15, no. 3, p. 1075, 2022, doi: 10.3390/en15031075.
Hack, Jannis, et al. “Branched versus Linear Structure : Lowering the CO2 Desorption Temperature of Polyethylenimine-Functionalized Silica Adsorbents.” Energies, vol. 15, no. 3, 2022, p. 1075, https://doi.org/10.3390/en15031075.
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