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

Berger E, Hahn MW, Przybilla T, Winter B, Spiecker E, Jentys A, Lercher JA (2016)

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Journal of Energy Chemistry Elsevier Science B.V.

Book Volume: 25

Pages Range: 327-335

Journal Issue: 2

DOI: 10.1016/j.jechem.2016.02.005

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.

Authors with CRIS profile

Thomas Przybilla Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Benjamin Apeleo Zubiri Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)

Additional Organisation(s)

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

Involved external institutions

Technische Universität München (TUM) DE Germany (DE)

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://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.

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