Alumina-supported [Emim][Gly] ionic liquid for CO2 capture from model flue-gas

In this paper, we report on CO2 capture results under model flue-gas conditions for a commercial γ-Al2O3 functionalized with [Emim][Gly] ionic liquid (IL) at 5 and 9% wt. loadings. N2 pore size analysis for the selected sorbents demonstrated that the adopted impregnation protocol was effective in producing a uniform distribution of the IL into the substrate pores. CO2 dynamic adsorption runs at 303 and 353 K revealed that an increase in the operating temperature determines longer breakpoint times and slower saturation kinetics for the functionalized sorbents. Both functionalized sorbents displayed an enhanced CO2 capture capacity with respect to the parent sorbent, mainly at 353 K and at larger IL loading (up to a threefold increase in the best case), likely for a greater availability of reactive centers deriving from a reduction of the active phase viscosity at higher temperature.