Model structures of molten salt-promoted MgO to probe the mechanism of MgCO₃ formation during CO₂ capture at a solid-liquid interface.

ABSTRACT: MgO is a promising solid oxide-based sorbent to capture anthropogenic CO₂ emissions due to its high theoretical gravimetric CO₂ uptake and its abundance. When MgO is coated with alkali metal salts such as LiNO₃, NaNO₃, KNO₃, or their mixtures, the kinetics of the CO₂ uptake reaction is significantly faster resulting in a 15 times higher CO₂ uptake compared to bare MgO. However, the underlying mechanism that leads to this dramatic increase in the carbonation rate is still unclear. This study aims to determine the most favourable location for the nucleation and growth of MgCO₃ and more specifically, whether the carbonation occurs preferentially at the buried interface, the triple phase boundary (TPB), and

SUBMITTER: Bork AH 

PROVIDER: S-EPMC9383051 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature