CO2 Cycloaddition to Styrene Oxide Catalysed by ZnBr2 Impregnated Rice Husk Ash Silica: Structural and Kinetics Studies. Issue 40 (25th October 2022)

• Record Type: Journal Article
• Authors: Yao, Swee Yi; Iqbal, Anwar; Abu Bakar, N. H. H.; Yusop, Muhammad Rahimi; Pauzi, Hariy; Kanakaraju, Devagi
• Is Part Of: ChemistrySelect. Volume 7:Issue 40(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-25
• Subjects: Carbon dioxide -- cycloaddition -- rice husk -- ring opening reaction -- styrene oxide -- ZnBr2; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202201970
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: 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. Abstract : Rice husk ash silica incorporated with 0.5 w/w% of Zn (0.5wt %ZnBr2 ‐SiO2 ) is active in the CO2 cycloaddition to styrene oxide to form styrene carbonate under the optimum conditions of 130 °C, 60 bar, 3 h and solventless. The catalyst was highly stable and could be reused several times without losing its catalytic potential.