Mechanism of CO2 capture in nanostructured sodium amide encapsulated in porous silica

Abstract Nanostructured sodium amide encapsulated in a porous silica gel matrix (“NaNH 2 -SG”) was investigated for CO 2 capture and storage by in-situ gravimetric gas sorption. Exposure of NaNH 2 -SG to CO 2 at 25 °C and 1 bar pressure resulted in ~3.6 wt% CO 2 uptake over eight sorption/desorption cycles. Over 90% of the CO 2 uptake was non-reversible due to reaction between CO 2 and NaNH 2 to form sodium carbamate, as confirmed by 13 C and 23 Na 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 NaNH 2 -SG to Na-carbamate-SG), and of CO 2 capture by NaNH 2 -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 CO 2 capture and long-term storage.