| 초록 |
Carbon dioxide is increasingly regarded as a ubiquitous and nontoxic C1 feedstock for the preparation of bulk commodity chemicals, and thus, it can be considered as a promising future alternative to depleting carbon-based fossil fuel sources. Zeolitic imidazolate frameworks (ZIF) are nowadays acclaimed porous framework materials for CO2 adsorption. In here, a highly porous zeolitic imidazolate framework (ZIF-22) with LTA topology was synthesized by solvothermal and microwave methods using Zn(NO3)2.4H2O and 5-azabenzimidazolate linker. The synthesized ZIF-22 was characterized using XRD and SEM techniques and were examined for its catalytic abilities for the cycloaddition of CO2 to propylene oxide (PO) yielding propylene carbonate under solvent free and co-catalyst free moderate reaction conditions. The mechanism of catalysis is thought to involve the Lewis acidic metal centers (Zn) and the N atom in the 5th position of the 5-azabenzimidazole linker acting synergistically. Through this study, we aimed at exploring the possibility of tuning ZIF materials as a bridge between CO2 adsorption and transformation into value added products. |
