Carbon dioxide (CO 2 ) conversion is an efficient option to mitigate environmental impacts caused by CO 2 high concentration in the atmosphere. In this work are described catalytic activities of surface active ionic liquids (SAILs) composed of well-known cations 1-butyl-3-methylimidazolium ([bmim + ]) and tetra-n-butylammonium ([TBA + ]) and long alkyl chain anions: lauryl sulfate ([) and lauroyl sarcosinate ([C 12 SAR − ]) for cyclic carbonate synthesis. Results evidenced that [TBA + ] is more active as a catalyst due to its higher molecular volume increasing the cationanion distance and weakening the electrostatic interaction resulting in a more electrophilic cation. The [TBA][C 12 BSO 3 ] SAIL presented better catalytic activity for styrene carbonate (SC) synthesis, reaching 81.4% of conversion and 87.0% of selectivity as well as the high recycle capacity and possible application as catalyst for the syntheses of different cyclic carbonates: glycidyl isopropyl ether carbonate (GC) and epichlorohydrin carbonate (EC).
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