Synthesis of propylene carbonate from CO2 and propylene oxide:hydrogen bond activation strategy
Under the background of"carbon peaking and carbon neutrality goals",the comprehensive utilization of CO2 meets great challenges and opportunities.Furthermore,the conversion of CO2 into high value-added chemicals is of great significance for energy conservation,emission reduction and carbon recycling.The conversion of CO2 and epoxides into cyclic carbonates through cycloaddition reaction is one of the important ways of carbon resource recycling.The effects of hydrogen bond donor on cycloaddition reaction of propylene oxide(PO)in homogeneous system with tetrabutylammonium bromide(TBABr)as catalyst were explored in detail.In addition,the polarity of linear alcohols and phenols were investigated for enhancing the catalytic performance,respectively.It was found that the conversion of PO shows significantly increased propylene epoxide conversion from 49.8%to 99.8%while maintaining high propylene carbonate selectivity(99.51%)under the mild conditions(100℃,2 h,1.5 MPa),which is much higher than that of non-hydrogen bond donor system.In addition,this study quantitatively described the impact of the polar parameters of hydrogen bond donors(alcohols,phenols)on reaction performance by establishing a linear solvation energy relationship and a Kamlet-Taft expression.Meanwhile,the reaction mechanism of the hydrogen bond donor was elucidated.
propylene oxidecarbon dioxideionic liquidsKamlet-Taft equationhydrogen bond donor
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