how to convert diphenly from aniline
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The synthesis of diphenyl urea (DPU) was carried out with Cu-Fe/ZrO2 as heterogenous catalyst, starting from aniline and CO2 with acetonitrile as solvent. The effects of reaction conditions and the reusability of Cu-Fe/ZrO2 catalyst in the reaction of aniline and CO2 to DPU were investigated. Then the catalytic mechanism of Cu-Fe/ZrO2 in the reaction was proposed. The results showed that the suitable reaction conditions were as follows, catalyst to aniline mass ratio of 0. 10|, acetonitrile to aniline volume ratio of 1.0, reaction temperature of 160℃, CO2 initial pressure of 1 MPa and reaction time of 7 h, under which the conversion of aniline, the yield and selectivity of DPU were 5. 5%, 5. 3% and 96. 9%, respectively. There existed three kinds of active sites on the surface of Cu-Fe/ZrO2 catalyst, which were the metal site M, Lewis acid site Zrn+ and Lewis basic site Zr-O-. The cooperative catalysis of the three active sites favored the process of DPU synthesis. Cu-Fe/ZrO2 was deactivated after reused in DPU synthesis for 4 cycles due to the loss of Cu active species.
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