| 초록 |
The increasing concern over global warming necessitates the sequestration of CO2 released from power plants and industries. Thus, the transformation of CO2 to useful chemicals such as dimethyl carbonate, N,N’-disubstituted ureas, cyclic carbonates, cyclic urethanes, formic acid, etc are highly demanded. Five-membered cyclic carbonates, catalytically synthesized by the cycloaddition of CO2 with epoxides, are used as solvents, electrolytes batteries, intermediates in chemical, pharmaceutical and polymer synthesis. Herein we report quaternization as an efficient PSM technique for tuning amine functionalized MIL-53 for an efficient, solvent-free synthesis of cyclic carbonates from epoxide and CO2. A series of quaternized amine-functionalized MIL-53 with various alkyl chain lengths and halides (X=Cl, Br, I) were synthesized, characterized using various physicochemical techniques and studied the influence of alkyl chain length and halides in exhibiting the catalytic activity for cycloaddition. MIL-53-NMe3I which gave the highest conversion was synthesized using microwave energy, thereby reducing the time for catalyst synthesis while maintaining more or less of the activity. |
