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Title: Role of Alumina Basicity in CO 2 Uptake in 3‐Aminopropylsilyl‐Grafted Alumina Adsorbents

Abstract

Abstract Oxide‐supported amine materials are widely known to be effective CO 2 sorbents under simulated flue‐gas and direct‐air‐capture conditions. Most work has focused on amine species loaded onto porous silica supports, though potential stability advantages may be offered through the use of porous alumina supports. Unlike silica materials, which are comparably inert, porous alumina materials can be tuned to have substantial acidity and/or basicity. Owing to their amphoteric nature, alumina supports play a more active role in CO 2 sorption than silica supports, potentially directly participating in the adsorption process. In this work, primary amines associated with 3‐aminopropyltriethoxysilane are grafted onto two different mesoporous alumina materials having different levels of basicity. Adsorbent materials with different amine loadings are prepared, and the CO 2 ‐adsorption behavior of similar amines on the two alumina supports is demonstrated to be different. At low amine loadings, the inherent properties of the support surface play a significant role, whereas at high amine loadings, when the alumina surface is effectively blocked, the sorbents prepared on the two supports behave similarly. At high amine loadings, amine–CO 2 –amine interactions are shown to dominate, leading to adsorbed species that appear similar to the species formed over silica‐supported aminemore » materials. The sorbent properties are comprehensively characterized using N 2 physisorption analysis, in situ FTIR spectroscopy, and adsorption microcalorimetry.« less

Authors:
 [1];  [2];  [1]; ORCiD logo [1]
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  1. School of Chemical and Biomolecular Engineering Georgia Institute of Technology 311 Ferst Drive, NW Atlanta GA 30332 USA
  2. School of Chemical and Biomolecular Engineering Georgia Institute of Technology 311 Ferst Drive, NW Atlanta GA 30332 USA, Department of Chemical and Biomolecular Engineering (BK-21 plus) Korea Advanced Institute of Science and Technology Daejeon 305-701 Republic of Korea
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1400836
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Name: ChemSusChem Journal Volume: 10 Journal Issue: 10; Journal ID: ISSN 1864-5631
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Potter, Matthew E., Cho, Kyeong Min, Lee, Jason J., and Jones, Christopher W. Role of Alumina Basicity in CO 2 Uptake in 3‐Aminopropylsilyl‐Grafted Alumina Adsorbents. Germany: N. p., 2017. Web. doi:10.1002/cssc.201700115.
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Potter, Matthew E., Cho, Kyeong Min, Lee, Jason J., & Jones, Christopher W. Role of Alumina Basicity in CO 2 Uptake in 3‐Aminopropylsilyl‐Grafted Alumina Adsorbents. Germany. https://doi.org/10.1002/cssc.201700115
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Potter, Matthew E., Cho, Kyeong Min, Lee, Jason J., and Jones, Christopher W. Wed . "Role of Alumina Basicity in CO 2 Uptake in 3‐Aminopropylsilyl‐Grafted Alumina Adsorbents". Germany. https://doi.org/10.1002/cssc.201700115.
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@article{osti_1400836,
title = {Role of Alumina Basicity in CO 2 Uptake in 3‐Aminopropylsilyl‐Grafted Alumina Adsorbents},
author = {Potter, Matthew E. and Cho, Kyeong Min and Lee, Jason J. and Jones, Christopher W.},
abstractNote = {Abstract Oxide‐supported amine materials are widely known to be effective CO 2 sorbents under simulated flue‐gas and direct‐air‐capture conditions. Most work has focused on amine species loaded onto porous silica supports, though potential stability advantages may be offered through the use of porous alumina supports. Unlike silica materials, which are comparably inert, porous alumina materials can be tuned to have substantial acidity and/or basicity. Owing to their amphoteric nature, alumina supports play a more active role in CO 2 sorption than silica supports, potentially directly participating in the adsorption process. In this work, primary amines associated with 3‐aminopropyltriethoxysilane are grafted onto two different mesoporous alumina materials having different levels of basicity. Adsorbent materials with different amine loadings are prepared, and the CO 2 ‐adsorption behavior of similar amines on the two alumina supports is demonstrated to be different. At low amine loadings, the inherent properties of the support surface play a significant role, whereas at high amine loadings, when the alumina surface is effectively blocked, the sorbents prepared on the two supports behave similarly. At high amine loadings, amine–CO 2 –amine interactions are shown to dominate, leading to adsorbed species that appear similar to the species formed over silica‐supported amine materials. The sorbent properties are comprehensively characterized using N 2 physisorption analysis, in situ FTIR spectroscopy, and adsorption microcalorimetry.},
doi = {10.1002/cssc.201700115},
journal = {ChemSusChem},
number = 10,
volume = 10,
place = {Germany},
year = {Wed Apr 26 00:00:00 EDT 2017},
month = {Wed Apr 26 00:00:00 EDT 2017}
}
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https://doi.org/10.1002/cssc.201700115
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