Abstract
We have used solid-state nuclear magnetic resonance (NMR) of 29Si to monitor the reaction of forsterite (Mg2SiO4) with isotopically enriched 13CO2. Fate of silicon that comes from dissolution of forsterite in the presence of water or NaCl brine was monitored as a function of depth in a packed bed reactor, which used elevated-temperature and -pressure conditions to mimic underground geological sequestration conditions. Silicon provides an important window into the reaction since the precipitation of amorphous silica can affect forsterite dissolution, and solid-state magic-angle spinning NMR can readily distinguish between 29Si in forsterite and amorphous silica. Furthermore, differences between Q3 and Q4 species of amorphous silica were observed as a function of depth. Results differed between water- and brine-based reactions, with enhanced dissolution of forsterite observed in the brine.
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