Impact of solvents and surfactants on the self-assembly of nanostructured amine functionalized silica spheres for CO2 capture

Journal article
(Original article)


Publication Details

Author(s): Berger E, Hahn MW, Przybilla T, Winter B, Spiecker E, Jentys A, Lercher JA
Journal: Journal of Energy Chemistry
Publication year: 2016
Volume: 25
Journal issue: 2
Pages range: 327-335
ISSN: 2095-4956


Abstract


Macroscopic SiO2 spheres with a homogeneous amine distribution were synthesized by a one-step emulsion based synthesis approach in a flow column reactor. The CO2 adsorption capacity of the nano structured amine-functionalized silica spheres was studied in absence and presence of H2O. The structural properties were adjusted by varying solvents and surfactants during the synthesis and, at constant amine loadings, were found to be the main factor for influencing the CO2 sorption capacities. Under water-free conditions CO2 is bound to the amino groups via the formation of carbamates, which require two neighboring amino groups to adsorb one CO2 molecule. At constant amine concentrations sorbents with lower surface area allow to establish a higher amine density on the surface, which enhances the CO2 uptake capacities under dry conditions. In presence of H2O the CO2 adsorption changes to 1:1 stoichiometry due to stabilization of carbamates by protonation of H2O and formation of further species such as bicarbonates, which should in principle double the adsorption capacities. Low concentrations of physisorbed H2O (0.3 mmol/g) did not impair the adsorption capacity of the adsorbents for CO2, while at higher water uptakes (0.6 and 1.1 mmol/g) the CO2 uptake is reduced, which could be attributed to capillary condensation of H2O or formation of bulky reaction products blocking inner pores and access to active sites. (C) 2016 Science Press and Dalian Institute of Chemical Physics. All rights reserved.



FAU Authors / FAU Editors

Przybilla, Thomas
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Apeleo Zubiri, Benjamin Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


External institutions with authors

Technische Universität München (TUM)


Research Fields

A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Berger, E., Hahn, M.W., Przybilla, T., Winter, B., Spiecker, E., Jentys, A., & Lercher, J.A. (2016). Impact of solvents and surfactants on the self-assembly of nanostructured amine functionalized silica spheres for CO2 capture. Journal of Energy Chemistry, 25(2), 327-335. https://dx.doi.org/10.1016/j.jechem.2016.02.005

MLA:
Berger, Edith, et al. "Impact of solvents and surfactants on the self-assembly of nanostructured amine functionalized silica spheres for CO2 capture." Journal of Energy Chemistry 25.2 (2016): 327-335.

BibTeX: 

Last updated on 2019-29-05 at 09:24