Influence of confinement in mesoporous silica on diffusion of a mixture of carbon dioxide and an imidazolium-based ionic liquid by high field diffusion NMR
作者： Eric D. Hazelbaker , Rémy Guillet-Nicolas , Matthias Thommes , Freddy Kleitz , Sergey Vasenkov
DOI: 10.1016/J.MICROMESO.2014.12.005
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摘要: Abstract Proton and carbon-13 pulsed field gradient (PFG) NMR was applied to study diffusion of the mixture carbon dioxide ionic liquid 1- n -butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide under condition confinement in mesopores KIT-6 silica. The results these studies were compared with obtained for corresponding bulk pure (IL) as well confined IL. It observed that mesopores, which fully loaded IL, reduces cation diffusivity by around a factor two comparison CO 2 /IL or This result short times when possible transport resistances at external surface particles are not expected change intraparticle cations. large experimental uncertainty measurements smallest time prevented making definitive conclusion about influence on diffusivity. reported data suggest conditions can be comparable even larger than mixture. For times, both diffusivities found decrease increasing time. dependence attributed particles.
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