CO2 Capture Using Silica and Molecular Sieve Impregnated with [hmim][Tf2N]

Abstract

Solid supported ionic liq. can provide high surface area for better CO2 adsorption as well as reduces the amt. of ionic liq. used for CO2 absorption. In the present work, SiO2 and Mol. Sieve were impregnated with 10wt% of [hmim][Tf2N], and tested for CO2 adsorption at 10-40 bar. From the screening process, 10%[hmim][Tf2N]-Si was obsd. to give higher CO2 adsorption compared to [hmim][Tf2N]-MolSieve, and 10%[hmim][Tf2N]-Si was selected for further investigation. The expt. was further investigated by measuring CO2 adsorption at 25, 40, and 60 °C, using 10%[hmim][Tf2N]-Si. The highest CO2 captured showed by 10%[hmim][Tf2N]-Si was at 298 K. The CO2 adsorption was also modeled using Langmuir and Freundlich isotherms, and the adsorption was best fitted using Freundlich isotherm at 25 °C with 0.9813 R2 value. [on SciFinder(R)]