Synthesis of carbamates from carbon dioxide using Ni/CeO2-ZrO2 catalyst

Abstract

Ni/CeO2-ZrO2 catalyst prepared by impregnation of Ni on CeO2-ZrO2 synthesized by surfactant-assisted templating route was characterized by N2 physisoption, XRD, and TPR. The results showed that the catalyst prepared by surfactant-assisted templating route was Ni/CeO2-ZrO2 by X-ray diffraction technique. To confirm characteristic of Ni/CeO2-ZrO2 catalyst followed by considering The reduction temperature of catalyst from Temperature reduction program method. And it was studied on surface area of catalyst by N2 physisoption technique. It was used to catalyze for the synthesis of carbamates in the reaction of amine and n-butyl bromide with gaseous carbon dioxide. These experiments were conducted at temperature of 70, 80 and 90 oC and the pressure of carbon dioxide was varied from 2-5 bars. After 4 hours of each reaction, the catalyst was removed and the product was separated by column chromatography. To study about many factor that influence to the reaction such as temperature, pressure, amount of catalyst and types of amines, that were used in the system. However, in this synthesis carbon dioxide was consumed and no solvent was required.