Flue Gas Cleaning By Ionic Liquid Selective Gas Absorption.

Abstract:

Combustion of fossil fuels during energy production generates pollutants in the fluegases which have to be effectively removed to avoid emission. In this work, we demonstrate how ionic liquids (ILs) can be tuned by design to perform as selective, high-capacity absorbents of environmentally problematic gases like, e.g. SO2 and in a pioneering project also for NO. Reversible absorption performance has been tested for several different ILs at different temperatures, pressures and flue gas compositions. Furthermore, different porous, high surface area carriers have been applied as supports for the ILs to obtain Supported Ionic Liquid-Phase (SILP) absorber materials. The use of solid SILP absorbers with selected ILs were found to significantly improve the absorption capacity and sorption dynamics at low flue gas concentration, thus making the applicability of ILs viable in temperature or pressure swing processes eventually turning the pollutants to useful mineral acids byseparate catalytic conversion.

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