KINETIC MODELING OF OXIDATIVE CARBONYLATION OF ANILINE OVER PD/C-NAI CATALYST

Kinetics of oxidative carbonylation of aniline to N,N'-diphenylurea has been investigated using the Pd/C-NaI catalyst system. The effect of the concentration of aniline, catalyst loading, partial pressures of CO and O2, and temperature on the rate of reaction has been studied. The rate varied linearly with catalyst and with 1.5 order with respect to aniline concentration. With an increase in CO partial pressure, the rate first increased and then was independent of p(CO) at higher pressures. The rate vs p(O2) plot passed through a maximum indicating substrate inhibition at higher p(O2). On the basis of these rate data, a rate equation has been proposed and kinetic parameters have been evaluated. The activation energy was found to be 82.7 kJ/mol.