Preparation method for synthesizing aniline catalyst by undergoing hydrogenation reaction on nitrobenzene

Abstract

The invention discloses a preparation method for synthesizing an aniline catalyst by undergoing a hydrogenation reaction on nitrobenzene. The method comprises the following steps of: reducing a PdCl2 aqueous solution under the protection of sodium citrate by taking a NaBH4 aqueous solution as a reducing agent to obtain Pd nanoparticle sol; and mixing and stirring an ultrasonically-treated carbon nanotube in the aqueous solution with the Pd nanoparticle sol to form a Pd-carbon nanotube catalyst. The aniline catalyst shows very high activity in a reaction for synthesizing aniline through hydrogenation of nitrobenzene, and has long cycle life.

Description

technical field

[0001] The invention relates to a preparation method of a catalyst for synthesizing aniline by hydrogenation reaction of nitrobenzene. Background technique

[0002] Due to physical effects such as surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect, metal nanoparticles have unique optical, electrical, mechanical and other excellent properties, and have broad application prospects in the high-tech field. Highly dispersed Pt, Pd, Ni, Rh, etc. have been reported (Catal.Commun., 2009(10): 1203-1206.Catal.Lett., 2002(84): 205-208.Mater.Chem.Phys., 2007 (103):225-229.) can be applied in heterogeneous hydrogenation reactions, and exhibit very high activity and selectivity. However, due to the relatively large specific surface energy of metal nanoparticles, they are easy to agglomerate, resulting in reduced catalyst activity and lifetime. Carbon nanotubes have a very large specific surface area, good electrical conductivi...