Abstract
The influence of the composition of aqueous solvents containing 1,4-phenylenediamine on the rate and selectivity of the liquid-phase hydrogenation of 4-nitroaniline was studied. The observed reaction rates decreased by a factor of from 2 to 8 and the activation energies on the equiaccessible surface of Raney nickel remained virtually unchanged as the concentration of 1,4-phenylenediamine in solution increased. The rate constants for the hydrogenation of 4-nitroaniline and its adsorption values and the heats of solvation in aqueous solutions of 1,4-phenylenediamine were found to be interrelated. The data obtained are discussed in terms of the influence of specific solvation interactions on adsorption and reaction rate constants on the surface of Raney nickel.
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