首页|Thermochemical study of CO2 capture by mesoporous silica gel loaded with the amino acid ionic liquid l-ethyl-3-methylimidazolium glycinate
Thermochemical study of CO2 capture by mesoporous silica gel loaded with the amino acid ionic liquid l-ethyl-3-methylimidazolium glycinate
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NSTL
A series of composite CO2 sorbents were obtained by placing an amino acid ionic liquid(AAIL)l-Ethyl-3-meth-ylimidazolium glycine([Emim][Gly])into mesoporous silica gel using an impregnation method.The parameters of the porous structure for the silica support and composite sorbents were determined from nitrogen adsorption-desorption isotherms measured at 77 K.The morphology of the materials was studied using field-emission scanning electron microscopy.It was shown that at lower[Emim][Gly] loadings(<50 wt%),the sorption is fast and the dynamic CO2 sorption capacity of the material is proportional to the mass content of the AAIL.At higher[Emim][Gly] loadings(>50 wt%),the rate of CO2 sorption by the AAIL decreases due to hindered mass transfer.An increase in CO2 concentration in the gas flow leads to a faster sorption and higher CO2 sorption capacity for the AAIL-containing composite.Meanwhile,the integral enthalpy of sorption decreases with increasing CO2 concentration,which can be explained by the greater contribution of physical adsorption/absorption processes to the total CO2 sorption capacity at higher CO2 concentrations.The most promising composite material(40 wt%[Emim][Gly]/SiO2)was tested in consecutive temperature-swing sorption-desorption cycles.It was demonstrated that lowering the regeneration temperature from 100 to 80 ℃ leads to a decrease in the dynamic sorption capacity of the material,but ensures its stability in the cyclic sorption-desorption process.
NSTL
