Efficient Fixation of CO2 to Cyclic Carbonate Using Hydroxyl-Functionalized Protic Ionic Liquids with Multiple Ion Pairs under Mild Conditions

Ziyang Xu, Fangfang Zhao, Yuanhao Wang,Ping Liu, Yulu Qu, Zhiyi Chen, Wanliang Yang,Tianxiang Zhao

Separation and Purification Technology（2025）SCI 1区

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Abstract

The development of catalysts with high stability, easy recovery, and multiple active sites is a particularly challenging aspect of CO2 catalysis. In this study, several hydroxyl-functionalized ionic liquids (HPILs) with multiple active sites were developed to achieve efficient CO2 conversion from flue gas. We investigated the cycloaddition performance with CO2 using these HPILs as catalysts and allyl glycidyl ethers (AGE) as model substrates. Among these, the [TDMPH]I catalysts, featuring I- and hydroxyl active sites, achieved impressive product yields (98 %) and selectivity (>99 %) at 60 degrees C, 1 bar, and 5 mol% catalyst dosage over 4 h. Notably, this reaction was conducted under solvent-free conditions without the need for co-catalysts. Furthermore, these ionic liquids exhibit non-homogeneous catalyst characteristics, enabling efficient recovery via ethyl acetate crystallization, along with excellent cyclic stability and high activity.

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Key words

Ionic liquids,Hydroxyl-functionalized,Multi-active site,Cyclic carbonates,Ionic liquids,CO(2 )conversion,Hydroxyl-functionalized,Multi-active site,Cyclic carbonates

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