One-Pot Synthesis of Cyclo-Carbonate from Styrene and CO2 over the ZrxCe1-xO2/NC Catalyst
The conversion of CO2 and olefin to cyclo-carbonate is one of effective carbon-immobilizing strategies.The zirconium-cerium bimetallic catalysts supported on the nitrogen-doped porous carbon(ZrxCe1-xO2/NC)were designed and prepared.Their morphology,crystal,pore structure and acid-base characters of the catalysts were monitored by X-Ray Diffraction(XRD),scanning electron microscope(SEM),N2 adsorption-desorption isotherm(N2-adsorption),CO2-temperature program desorption(CO2-TPD)and NH3-temperature program desorption(NH3-TPD).The results show that the catalyst can catalyse the one-pot synthesis of cyclo-carbonate by CO2 and styrene with halogen-free conditions.The Zr0.75Ce0.25O2/NC show the best conversion of 74.87%and selectivity of 80.43%under 2 MPa CO2 through a bi-period of 80℃/8 h and 150℃/8 h.This is attributed to the uniform dispersion of CeO2 and ZrO2 on the carbon support,as well as the synergistic effect of acid-base sites.
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