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Bifunctional ZIF-78 heterogeneous catalyst with dual Lewis acidic and basic sites for carbon dioxide fixation via cyclic carbonate synthesis

Authors :
Bao-Tsan Ko
Kun-Yi Andrew Lin
Yi-Feng Lin
Kai-Wei Huang
Source :
Journal of CO2 Utilization. 22:178-183
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

Abstract

Zeolitic imidazole framework-78 (ZIF-78) hexagonal prisms, a combination of Zn metal and imidazolate linkers, were successfully synthesized using a facile hydrothermal process. The as-prepared ZIF-78 hexagonal prisms possessed a bifunctional property with dual Lewis acidic (Zn atom) and basic sites (-NH groups of the imidazolate linkers). This bifunctional property allowed the ZIF-78 crystals to be a potential heterogeneous catalyst in the CO 2 /propylene oxide (PO) cycloaddition reaction for the synthesis of propylene carbonate (PC). To the best of our knowledge, this is the first work to use microporous ZIF-78 crystals as a catalyst for the CO 2 /PO cycloaddition reaction without the addition of any co-catalyst or solvent. The effects of reaction temperature, pressure and reaction time on the PO conversion, PC selectivity and yield were also investigated in this work. The highest PC yield of 54% was obtained at a reaction temperature of 150 °C, pressure of 10 kg/cm 2 and reaction time of 15 h. Moreover, a possible mechanism of the cycloaddition reaction was also proposed in this study.

Details

ISSN :
22129820
Volume :
22
Database :
OpenAIRE
Journal :
Journal of CO2 Utilization
Accession number :
edsair.doi...........476c4873e5263a30c48bb84896e55d5c
Full Text :
https://doi.org/10.1016/j.jcou.2017.10.005