Graphene loaded high-dispersion nano Ni catalyst as well as preparation method and application thereof

Abstract

The invention provides a graphene loaded high-dispersion nano Ni catalyst as well as a preparation method and application thereof. The catalyst is obtained by loading high-dispersion Ni nano-metal on the surface of graphene, and doping less amorphous Al2O3, wherein the mass percent content of graphene is 40-67%, the mass percent content of Ni is 10-40%, the mass percent content of amorphous Al2O3 is 2-8%, the size distribution of Ni particles is 8-13nm, and the specific area of the catalyst is 155-200 m<2> / g. The preparation method comprises the following steps of: preparing a graphene / lamellar bimetal hydroxide composite material in one step through the hydroxide precipitation and reduction effect, and then preparing the graphene loaded high-dispersion metal Ni nano catalyst through an in-situ self-reduction method by using the reducibility of graphene. The catalyst is used for selectively hydrogenating the cinnamyl aldehyde to synthesize the benzenepropanal, and the conversion rate and the benzenepropanal selectivity are respectively 86-100% and 88-96%.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a highly dispersed and supported nano-Ni catalyst. The catalyst is used for the selective catalytic hydrogenation of cinnamaldehyde. technical background [0002] Phenylpropionaldehyde is widely used in the preparation of various floral flavors, and also has important applications in the pharmaceutical industry. Phenylpropionaldehyde is usually produced by catalytic hydrogenation of cinnamaldehyde. Cinnamaldehyde is a typical α, β-unsaturated aldehyde, and the C=O, C=C and benzene rings in its molecular structure form a large conjugated system, so one or more easily occur during the catalytic hydrogenation of cinnamaldehyde. Catalytic hydrogenation of unsaturated groups. At the same time, due to the steric hindrance of the benzene ring, the C=O bond is easily reduced, so even palladium-based catalysts with excellent hydrogenation activity a...

AI Technical Summary

Problems solved by technology

However, LDHs nanoparticles are easy to agglomerate. During the heating and calcination process, the LDHs laminates gradually collapse and the particles sinter and agglomerate, which will lead to poor dispersion of LDHs or particles after calcination, a decrease in specific surface area, and a decrease in the number of active centers, thereby affecting its activity.

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