Mechanism of CO 2 capture in nanostructured sodium amide encapsulated in porous silica

Mi Tian, Antoine Buchard, Stephen A. Wells, Yanan Fang, Laura Torrente-murciano, Antony Nearchou, Zhili Dong, Timothy J. White, Asel Sartbaeva, Valeska P. Ting

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalSurface & Coatings Technology
Volume350
Early online date28 Jun 2018
DOIs
Publication statusPublished - 25 Sep 2018

Fingerprint

Carbon Monoxide
Encapsulation
Amides
Silicon Dioxide
amides
Sorption
Sodium
Silica
sodium
Nanoparticles
silicon dioxide
sorption
Silica gel
Substrates
Electronic structure
Desorption
nanoparticles
Nuclear magnetic resonance
silica gel
Carbamates

Cite this

Mechanism of CO 2 capture in nanostructured sodium amide encapsulated in porous silica. / Tian, Mi; Buchard, Antoine; Wells, Stephen A.; Fang, Yanan; Torrente-murciano, Laura; Nearchou, Antony; Dong, Zhili; White, Timothy J.; Sartbaeva, Asel; Ting, Valeska P.

In: Surface & Coatings Technology, Vol. 350, 25.09.2018, p. 227-233.

Research output: Contribution to journalArticle

Tian, Mi ; Buchard, Antoine ; Wells, Stephen A. ; Fang, Yanan ; Torrente-murciano, Laura ; Nearchou, Antony ; Dong, Zhili ; White, Timothy J. ; Sartbaeva, Asel ; Ting, Valeska P. / Mechanism of CO 2 capture in nanostructured sodium amide encapsulated in porous silica. In: Surface & Coatings Technology. 2018 ; Vol. 350. pp. 227-233.
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AU - Buchard, Antoine

AU - Wells, Stephen A.

AU - Fang, Yanan

AU - Torrente-murciano, Laura

AU - Nearchou, Antony

AU - Dong, Zhili

AU - White, Timothy J.

AU - Sartbaeva, Asel

AU - Ting, Valeska P.

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AB - 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.

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