G. Neri et al., KINETIC MODELING OF 2,4-DINITROTOLUENE HYDROGENATION OVER PD C/, Industrial & engineering chemistry research, 34(7), 1995, pp. 2226-2231
The kinetics of liquid phase hydrogenation of 2,4-dinitrotoluene (2,4-
DNT) to 2,4-diaminotoluene (2,4-DAT) were studied in ethanol with a 5%
Pd/C catalyst using a slurry reactor, in the temperature range betwee
n 278 and 323 K and at a pressure of 0.1 MPa. The reaction pathway has
been described by a Langmuir-Hinshelwood model with a noncompetitive
adsorption of the organic species and hydrogen on the active sites. Di
fferent reaction mechanisms have been tested. The best fitting of the
experimental data was obtained with a reaction mechanism involving thr
ee parallel routes leading from 2,4-DNT to 4-(hydroxyamino)-2-nitrotol
uene (4HA2NT), 4-amino-2-nitrotoluene (4A2NT), and 2-amino-4-nitrotolu
ene (2A4NT) which are then hydrogenated to 2,4-DAT through a series of
consecutive reactions. The rate constants and activation energy for e
ach reaction step have been reported.