Solid Supported [hmim][Tf₂N] for CO₂ Adsorption

Abstract:

Ionic liquids are new alternative solvents that can be used to separate carbon dioxide in the gas separation process. However, the high viscosity of ionic liquids limits the mass transfer of solutes into ionic liquids. In this work, 1-hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([hmi [Tf₂) was impregnated onto porous Al₂O₃ and SiO₂ and tested for CO₂ adsorption at pressure up to 40 bar at 25 °C. The screening process showed that [hmi [Tf₂-Si gave higher CO₂ adsorption capacity compared to [hmi [Tf₂-Al and pure [hmi [Tf₂. The experimental work was further investigated by varying the composition of [hmi [Tf₂ inside SiO₂ pores. The composition of [hmi [Tf₂ was varied from 10 wt% to 40 wt%. The result showed the 10 wt% composition gave the highest CO₂ adsorption compared to 20 wt%, 30 wt% and 40 wt%. The lower CO₂ adsorption by 20 wt%, 30 wt% and 40 wt% might be due to the blockage of SiO₂ pores by excess [hmi [Tf₂. From this research, it proved that porous solid support can provide high surface area that is necessary to accommodate intimate contact between CO₂ and solid supported ionic liquid and increases the CO₂ adsorption capacity.

• Periodical: Advanced Materials Research (Volume 879)
• Pages: 149-154
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.879.149
• Online since: January 2014
• Authors: Safiah Md Nurul, Mohammad Azmi Bustam, Normawati M. Yunus, Zakaria Man
• Keywords: [hmim][Tf₂N], CO₂ Adsorption, Solid Supported Ionic Liquid

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