Abstract
Supported room-temperature ionic liquid (RTIL) membranes are of industrial interest as possible carbon-sequestration and CO2-scrubbing agents, specifically in natural gas reforming processes. We report state-resolved scattering studies of CO2 from alkylimidazolium-based RTIL surfaces, containing either BF4− or Tf2N− anions. The scattered CO2 exhibits a two-temperature rotational distribution, well described in the context of a trapping−desorption/impulsive scattering (TD/IS) model. We find that the scattering dynamics are highly dependent upon the anion identity, implying that the anions are present at the interface and play a role in the gas−liquid collisions. Trends in the trapping−desorption fractions are in stark opposition with trends in the bulk Henry’s Law solubility constants, clearly highlighting the critical role of nonequilibrium dynamics over equilibrium bulk solubility properties in these high-energy collisions. These results are discussed in the context of composition, geometry, and local corrugation at the interface.
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