【摘 要】
：
Two kinds of bi-functional transition metal doped mesoporous materials(Fe-HMS and Fe-MCM-41)are prepared using one-step hydrothermal method and then treated with hydrochloric acid ethanol solution.The N2 adsorption and HRTEM results show that both of Fe-H
【机 构】
：
State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technolog
论文部分内容阅读
Two kinds of bi-functional transition metal doped mesoporous materials(Fe-HMS and Fe-MCM-41)are prepared using one-step hydrothermal method and then treated with hydrochloric acid ethanol solution.The N2 adsorption and HRTEM results show that both of Fe-HMS and Fe-MCM-41 possess mesoporous structure.The UV-vis results suggest that the Fe species are mainly located within the framework.The basicity of as-prepared samples was studied by temperature programmed desorption using CO2 as probe molecule(CO2-TPD).The catalytic performance of Fe-HMS and Fe-MCM-41 in CO2 cycloaddition largely depends on the amount of the accessible basic sites.The acid-base active sites,framework Fe and PDDA species cooperatively catalyze the CO2 cycloaddition for the production of cyclic carbonates under the condition without any co-catalyst.The conversion of epichlorohydrin(ECH)is 97.4％and the selectivity of chloropropene carbonate is 92.9％under optimal conditions.The approximate rate constant of cycload-dition reaction of CO2 with ECH under optimum reaction temperature is calculated.It is worth noting that the Fe-HMS material shows superior reusability than Fe-MCM-41.In addition,this work provides a facile way on the synthesis of bi-functional acid-base heterogeneous catalyst with outstanding catalytic performance for the fixation of CO2.
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