Georges Cordier

High selectivities in hydrogenation of halogenonitro-benzenes on Pd, Pt or raney nickel as catalysts

Publisher Summary Aromatic haloamines have a wide range of applications in the production of pharmaceuticals and agrochemical substances. The main route to these haloanilines involves reduction from the corresponding nitro compounds either with group VIII metal catalysts and hydrogen or with iron and hydrochloric acid. Most of the time, the reduction of halonitroaromatic to the corresponding amine is accompanied by simultaneous dehalogenation which lowers the yield and results in the formation of corrosive halogen acids. One of these families is included molecules in which the fluorine atom is contained within a CF 3 group bonded to the benzene core. This CF 3 group is insensitive to hydrogenation under operating conditions that are commonly used to reduce the NO 2 group in the nitrated precursor. The other family includes molecules containing at least one fluorine atom that is directly bonded to the aromatic core. Sometimes this aromatic core also contains chlorine atoms.

Selective Hydrogenation of Adiponitrile (ADN) to Hexamethylenediamine (HMD) in the Liquid Phase on Raney Catalysts: Synergetic Effect Between the Base in the Solution and the Iron Dope on the Catalyst

Abstract This paper is devoted to the fundamental study of the doping effect of iron metal added to Ni-Al alloy precursor of Raney nickel catalysts. Their activities and selectivities in the liquid phase were determined taking into account the effect of the basicity of the solvent. The experiments were performed on catalysts coming from homogeneous NiAl 3 and Ni 2 Al 3 phases. A synergetic effect between the base in the solution and the iron dope in the catalyst was demonstrated.