Invention Reference Number
A novel strategy was developed to solve the limitations of the current sorbent systems in CO2 chemisorption in terms of energy consumption in CO2 release and improved CO2 uptake capacity. Instead of leveraging the chemical bonding strength in the product as the driving force to selectively absorb CO2, carbanion-derived sorbents possessing conjugated and asymmetric structures are deployed in the form of ILs. By introducing substitutes with high steric hindrance and strong hydrogen bonding acceptance capability, the CO2 integration was driven by intermolecular proton transfer and structure rearrangement of the as-generated carboxylic acid intermediate. The cascade insertion of twoCO2 molecules into one carbanion site was achieved by in situ generation of an extra oxygen site. Notably, both spectroscopy and pressure-swing studies confirmed the facile sorbent regeneration under mild conditions, i.e., at room temperature under vacuum. The energy consumption can be further deduced by harnessing the phase changing behavior of the carbanion salt in crown ether, in which the CO2-saturatedproduct can be isolated, avoiding the energy input to heat up the solvent.
Contact
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