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Title: Mechanism of CO2 capture in nanostructured sodium amide encapsulated in porous silica
Authors: Tian, Mi
Buchard, Antoine
Wells, Stephen A.
Fang, Yanan
Torrente-Murciano, Laura
Nearchou, Antony
Dong, Zhili
White, Timothy John
Sartbaeva, Asel
Ting, Valeska P.
Keywords: Engineering::Materials
Issue Date: 2018
Source: Tian, M., Buchard, A., Wells, S., Fang, Y., Torrente-Murciano, L., Nearchou, A., . . . Ting, V. (2018). Mechanism of CO2 capture in nanostructured sodium amide encapsulated in porous silica. Surface and Coatings Technology, 350, 227-233. doi:10.1016/j.surfcoat.2018.06.049
Journal: Surface and Coatings Technology
Abstract: Nanostructured sodium amide encapsulated in a porous silica gel matrix (“NaNH2-SG”) was investigated for CO2 capture and storage by in-situ gravimetric gas sorption. Exposure of NaNH2-SG to CO2 at 25 °C and 1 bar pressure resulted in ~3.6 wt% CO2 uptake over eight sorption/desorption cycles. Over 90% of the CO2 uptake was non-reversible due to reaction between CO2 and NaNH2 to form sodium carbamate, as confirmed by 13C and 23Na solid-state NMR. Electronic structure calculations suggest a two-stage reaction process involving initial formation and subsequent rearrangement of the carbamate product. This research confirms the feasibility of sequential reactions of nanoparticles in a porous substrate (Na-SG to NaNH2-SG to Na-carbamate-SG), and of CO2 capture by NaNH2-SG nanoparticles stabilised by encapsulation within the porous substrate. This encapsulation method could allow further hygroscopic or reactive starting reagents or compounds to be explored for CO2 capture and long-term storage.
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2018.06.049
Rights: © 2018 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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