Study On The Catalytic Hydrogenation Of Levulinic Acid And P-Nitrobenzaldehyde By Cu/Graphene And Au/Graphene

Graphene is a single layer material which is one atom thick and carbons atoms packed in a hexagonal arrangement in sp2. As graphene has high specific surface area, excellent electronic and thermal properties, its application in catalysis has attracted more and more attention. In this article we prepared graphene by the oxidation-reduction method and prepared graphene oxide by improved Hummer method. Cu and Au were loaded on graphene, and the methods of loaded were explored. The catalysts were applied to the selective catalytic hydrogenation of unsaturated compounds.The first part of this paper is prepared Cu/rGO by deposition-precipitation, graphene oxide as the precursor, copper was loaded on the surface of the graphene oxide by precipitating, graphene oxide was reduced with an excess of sodium hydroxide under the high temperature, and water thermal reduction process for secondary reduction. We explored the effect of several factors in the preparation process of the catalyst on the catalytic activity. The catalyst used in the catalytic hydrogenation reaction of levulinic acid, the temperature was 120℃, under the condition of initial H2 pressure 2 MPa,2 h, selectivity could reach 100%.The second part of this article is about Au/rGO, it was prepared by sol immobilization, gold sol and graphene oxide colloid were mixed, the mixture was reduced by hydrothermal reduction under the condition of 110℃,3.5 MPa of the initial H2 pressure, the impact of various factors in the preparation process were explored. Selective catalytic hydrogenation of p-nitrobenzaldehyde was carried out after the reduction of the catalyst was washed, then it was used to the process of hydrogenation of p-nitrobenzaldehyde. Under the condition of 110℃, 3.5 MPa of the initial H2 pressure and 2 h of reacting time, the conversion rate reached 100%, the selectivity ofp-nitrobenzaldehyde could reach 94.3%.