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河北祥鹄科学仪器有限公司

100A Preparation of Cyclohexylamine by One-Step Total Hydrogenation of Nitrobenzene Catalyzed by Hubei University-Ni-Catalyst

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[Abstract]:
NoteThisresearchbytheHubeiUniversityCollaborativeInnovationCenter,anewmaterialfororganicchemicalsinHubeiUniversity,discussesthenickelcatalystfortheone-stephydrogenationofnitrobenzenetopreparecyclohexy
Note

This research by the Hubei University Collaborative Innovation Center, a new material for organic chemicals in Hubei University, discusses the nickel catalyst for the one-step hydrogenation of nitrobenzene to prepare cyclohexylamine. It is published in the important journal .

Abstract

The biochar-supported Ni catalyst was prepared by microwave heating impregnation method. The catalysts were characterized by XRD, TEM and XPS. 10% Ni / CSC-II catalyst showed good activity in the selective hydrogenation of nitrobenzene to cyclohexylamine. Under the conditions of 200 °C, 2.0 MPa H2, 100 mg lithium hydroxide, nitrobenzene The conversion rate is 100%, and the selectivity of the target product is up to 96.7%. The results show that microwave heating can improve the activity of the catalyst.

Details

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Conclusion

In this paper, the coconut shell carbon supported Ni nanocatalyst prepared by microwave assisted heating was applied to the selective hydrogenation of nitrobenzene. Microwave heating for 2h facilitates the dispersion of Ni on bio-based coconut shell charcoal and forms nanoparticles with a size of 5.0 nm. The results of catalytic activity experiments show that when the amount of lithium hydroxide is 100 mg and the pressure of hydrogen is 2.0 MPa, the reaction at 200 °C for 4 h, 10% Ni/CSC-II has a good catalytic effect in the catalytic hydrogenation of nitrobenzene.

Instrument

10% Ni /CSC-I catalyst preparation Using ordinary impregnation method, weigh 1.086g of nickel nitrate hexahydrate, dissolve with a certain amount of water, add 2.0g of coconut shell charcoal carrier while stirring, put the beaker containing the solution into In a magnetic stirrer with a hot water bath at 80 °C, the water was evaporated to dryness, and the obtained solid was placed in a blast drying oven at 100 °C for 12 h. Cooling, grinding, to obtain a catalyst precursor. Finally, the treated precursor was reduced in hydrogen gas (hydrogen flow control of 30mL / min) at 400 °C for 3 h in an open vacuum tube furnace to obtain 10% Ni/CSC-I.

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