A novel porous liquid for enhanced CO2 uptake to improve conversion efficiency

Abstract

Porous liquids (PLs) with unique porous frameworks and good flow properties can achieve coupling enhancement for CO₂ capture and conversion. In this paper, a series of novel PLs were designed and synthesized using UiO-66 as the framework and novel bi-cationic ionic liquids (ILs) as an excluded solvent. The prepared PLs showed significant improvement in CO₂ uptake capacity over ILs at different pressures and exhibited excellent CO₂ catalytic conversion performance, exceeding the sum of the effects of ILs and UiO-66. Especially at low pressure, the PLs still showed excellent catalytic performance, but the catalytic performance of the corresponding ILs was significantly reduced, which was due to the rapid adsorption and conversion of CO₂ by the porous framework of UiO-66 to improve the CO₂ uptake and transfer efficiency within the ILs, thus achieving coupling enhancement. It can provide a new way to realize the efficient conversion of CO₂ under milder conditions.