Highly Selective Hydrogenation of Adiponitrile to Hexamethyleneimine Catalyzed by Carbon Nitrogen Composited Nickel Catalysts
Hexamethyleneimine(HMI)is a crucial intermediate in the production of pharmaceuticals and agrochemi-cals,including penicillin,herbicides,and fungicides.In this study,supported Ni-based catalysts were prepared using solvent-assisted mechanochemical ball milling and pyrolysis,and the catalytic performance for the hydrogena-tion of 1,6-adiponitrile(ADN)to HMI was evaluate.The results demonstrated that the supported Ni-based catalyst Ni/IM-C(R)exhibited high activity for the hydrogenation of ADN to HMI in 98%yield.The catalyst Ni/IM-C(R)was prepared by co-ball milling nickel acetate,2-methylimidazole and activated carbon,followed by calcination in N2 and then reduced by H2.The surface structures and the chemical properties of the Ni/IM-C(R)catalyst were charac-terized via various techniques,including X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,energy-dispersive X-ray spectroscopy,transmission electron microscope,and N2 adsorption-desorption measurements.The characterization results indicated that nitrogen-doped carbon improved the dispersion of Ni nanoparticles in the Ni/IM-C(R)catalyst.The catalyst Ni/IM-C(R)displayed small Ni nanoparticles with high surface,which directed the high activity for the hydrogenation of ADN to HMI.Without additives,the Ni/IM-C(R)catalyzed hydrogenation of ADN exhibited excellent activity and high selectivity towards HMI.The Ni/IM-C(R)catalyst is stable and recyclable for several times without deactivation.The Ni/IM-C(R)catalyst is simple to be prepared and the Ni/IM-C(R)catalyzed hydrogenation of ADN is promising for industrial applications.
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