CO2 Cycloaddition to Styrene Oxide Catalysed by ZnBr2 Impregnated Rice Husk Ash Silica: Structural and Kinetics Studies
A series of ZnBr2 impregnated on rice husk ash silica catalysts were synthesised via the wet impregnation method for the CO2 cycloaddition to styrene oxide reaction. The X-ray diffraction (XRD) analysis indicates that the impregnation resulted in the deterioration of the silica’s pore channels. Cata...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/40306/1/Chemistry%20select%202022%20Dr%20Devagi_Abstract.pdf http://ir.unimas.my/id/eprint/40306/ https://chemistry-europe.onlinelibrary.wiley.com/hub/journal/23656549/overview https://doi.org/10.1002/slct.202201970 |
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| Summary: | A series of ZnBr2 impregnated on rice husk ash silica catalysts were synthesised via the wet impregnation method for the CO2 cycloaddition to styrene oxide reaction. The X-ray diffraction (XRD) analysis indicates that the impregnation resulted in the deterioration of the silica’s pore channels. Catalyst with 0.5 w/w % of Zn (0.5 wt%ZnBr2-SiO2) was highly active in the CO2 cycloaddition to styrene oxide. The conversion of styrene oxide (StO) was 89.1 %, with the styrene carbonate (SC) selectivity of
92.1% under the optimum conditions (130 °C, 60 bar, 3 h and
solventless). Additionally, the universality of 0.5 wt%ZnBr2-SiO2 was also studied with other epoxides, and it shows good to excellent activity. The catalytic performance of the 0.5 wt% ZnBr2-SiO2 remains constant after being reused three consecutive times. The activation energy of the reaction was determined to be 89.06 kJ/mol. |
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