Novas estratégias de uso de líquidos iônicos (LIS) para captura de CO2 : LIS suportados em sólidos porosos e LIS encapsulados

Abstract

Combustion of fossil fuel and industrial process are largely responsible for anthropogenic CO2 emission in the atmosphere. CO2 capture and storage technologies are suggested as the easiest and effective way to reduce CO2 emissions at a large scale. Current CO2 capture systems have some drawbacks such as high energy and equipment investment. Ionic liquids (ILs) can provide a reduction in these costs required for CO2 capture and could be considered as emerging and promising candidates. Despite this, ionic liquids present disadvantages, including high viscosity, which limit mass transfer. Supported ionic liquids in solids and encapsulated ionic liquids are proposed to overcome these limitations. In this work, we investigated the effect of IL immobilization in porous support (commercial silica and alumina) and a novel combination of water-based poly(ionic liquid)/ionic liquids, evaluating CO2 sorption, selectivity (CO2/N2), recyclability, sorption kinetics and thermal stability. The materials showed advantages in terms of mild conditions for the regeneration step, their reuse and stability for several consecutive cycles of sorption/desorption.