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New findings on CO2 adsorption on chitosan aerogels

Niemeyer, Philipp David und Ratke, Lorenz und Milow, Barbara (2020) New findings on CO2 adsorption on chitosan aerogels. Online Aerogel Seminar 2020, 16.-18. September 2020, Online (Hamburg, Deutschland).

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Kurzfassung

Numerous publications describe amine groups bearing materials for selective CO2 separation. Most of those materials are of microporous nature. The Young-Laplace equation predicts CO2 condensation at 273 K in pores below 6 nm. Therefore it is of interest if the recorded CO2 adsorption isotherms show CO2 condensation in specific pores or reveal selective adsorption on surfaces. To overcome the question of condensation in pores or adsorption via amine groups we investigated mesoporous chitosan aerogel beads with a mean pore size of 40 nm. CO2 sorption isotherms were recorded at 273 K and 298 K, see Figure 1. The isotherm shape reveals partly irreversible adsorption reactions. The adsorption branch was recorded up to 100 kPa. The subsequent recorded desorption branch does not match the adsorption branch. A difference builds up between adsorption and desorption. At the end of desorption the starting and ending values do not match. Four different adsorption reactions are responsible for the CO2 sorption isotherms of chitosan aerogel beads. Those are: 1) covalent reaction according to the carbamate mechanism [RNHCO2]- + [RNH3]+, 2) charge\adsorptive interaction [RNHCO2\CO2]- and [RNH3\CO2]+, 3) dipole\adsorptive interaction ROH\CO2, and 4) non-specific London interaction #\CO2. Maximum adsorption capacities at 100 kPa of 1 mmol/g and 0.6 mmol/g were recorded at 273 K and 298 K respectively. At low CO2 absolute pressure of 0.25 kPa the adsorption capacities are 0.05 mmol/g and 0.03 mmol/g at 273 K and 298 K respectively. Microporous and amine group bearing materials published usually report adsorption capacities of at least one order of magnitude larger than those found in our studies. The comparison of adsorption capacities from mesoporous and amine bearing chitosan aerogels with microporous and amine bearing materials emphasizes the importance of micropores for selective CO2 separation due to pore condensation.

elib-URL des Eintrags:https://elib.dlr.de/138044/
Dokumentart:Konferenzbeitrag (Poster)
Titel:New findings on CO2 adsorption on chitosan aerogels
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Niemeyer, Philipp DavidPhilipp.Niemeyer (at) dlr.dehttps://orcid.org/0000-0002-4386-2589NICHT SPEZIFIZIERT
Ratke, Lorenzlorenz.ratke (at) dlr.dehttps://orcid.org/0000-0003-2487-4717NICHT SPEZIFIZIERT
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728NICHT SPEZIFIZIERT
Datum:September 2020
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:chitosan aerogel, CO2 adsorption, chemisorption, physisorption, mesoporous adsorbent
Veranstaltungstitel:Online Aerogel Seminar 2020
Veranstaltungsort:Online (Hamburg, Deutschland)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:16.-18. September 2020
Veranstalter :Technische Universität Hamburg (TUHH)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Verkehrssystem
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V VS - Verkehrssystem
DLR - Teilgebiet (Projekt, Vorhaben):V - Energie und Verkehr (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele und Aerogelverbundwerkstoffe
Hinterlegt von: Niemeyer, Philipp David
Hinterlegt am:24 Nov 2020 16:49
Letzte Änderung:24 Nov 2020 16:49

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