Journal of the Chemical Society - Faraday Transactions p. 3507 - 3512 (1993)
Update date:2022-08-30
Topics:
Medina, Francisco
Salagre, Pilar
Sueiras, Jesus-Eduardo
Fierro, Jose-Luis-Garcia
Studies of the chemical preparation, X-ray photoelectron spectra (XPS), activation energies of reduction, temperature-programmed reduction (TPR), X-ray diffraction (XRD) and catalytic activities of several nickel/α-alumina catalysts have been caried out for the catalytic hydrogenation of hexanedinitrile, in a continuous process at 1 atm pressure, 443 K, and in the absence of ammonia.XPS results show complete reduction of non-stoichiometric NiO on α-alumina at temperatures higher than 623 K and higher surface nickel dispersion with increasing nickel content anddecreasing reduction temperatures.Activation energies of reduction for the α-alumina-supported non-stoichiometric NIO were higher than those of the unsupported non-stoichiometric NiO.TPR results show that the initial and final temperatures of reduction of the α-alumina-supported nonstoichiometric NiO are higher with unsupported NiO, confirming the inhibiting effect of α-alumina on NiO reduction.XRD measurements show the presence of α-alumina, NiO and Ni phases, and also the increase in crystallite size with increasing reduction temperature.Catalytic conversions increase with the nickel content and selectivities toward 6-aminohexanenitrile increase at lower nickel contents, high space velocities, and higher metallic sintering, probably owing to the presence of a higher content of specific crystal sites responsible for the production of 6-aminohexanenitrile.A mechanism is proposed.
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