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Using zinc iodide and guanidine hydrochloride(50-01-1) as a two-component heterogeneous catalyst

Using zinc iodide and guanidine hydrochloride(50-01-1) as a two-component heterogeneous catalyst under mild reaction conditions and without the need for an organic solvent to co-catalyze the addition of carbon dioxide to the epoxy compound to form cyclic carbonates. The reaction was carried out at 100 °C and 1.0 MPa carbon dioxide for 1.5 h. The yield of propylene carbonate was 94% and the selectivity was more than 98%. The reaction system was simple and easy to obtain, the reaction conditions were mild, the reaction time was short and the efficiency was high. The effects of different experimental parameters on the yield of propylene carbonate were investigated, including the change of reaction temperature, the change of carbon dioxide pressure, the length of reaction time and the amount of catalyst and cocatalyst used in the reaction of different metals as Lewis acid. In order to study the general applicability and catalytic efficiency of Gnd Cl / Zn I2 catalyst, it is used to catalyze the cycloaddition reaction of epoxy compounds with different substituents such as 1,2-butylene oxide, epichlorohydrin, Oxidation of styrene, cyclohexene oxide and so on. In addition, the catalytic mechanism of the catalytic system was proposed. The synergistic catalysis of guanidine hydrochloride(50-01-1) and zinc iodide was carried out rapidly and efficiently. The NH3I-Zn / SBA-15 was able to catalyze the synthesis of cyclic carbonates by carbon dioxide, and the NH3I-Zn / SBA-15 was able to catalyze the carbon dioxide synthesis of carbon monoxide at a reaction temperature of 130 ° C, 3 MPa of carbon dioxide. Under pressure, a yield of 93% propylene carbonate and 99% selectivity were obtained after 12 h. The structure and properties of the synthesized catalyst NH3I-Zn / SBA-15 were characterized by XRD, N2 adsorption, TEM, FTIR and XPS. The influence of the change of the experimental parameters on the catalytic yield was discussed, including the different amounts of Zn doping in the doping amount of SBA-15, the protonation of different metal Zn doping amount of aminated SBA-15, the reaction temperature, pressure, reaction time and so on. The catalyst was recycled three times and the catalytic performance was good. Finally, the catalytic reaction mechanism of the catalyst was proposed.

 

 

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