Kinetics of chlorobenzene hydrodechlorination have been measured over Ni on SiO2, Al2O3, MgO, activated carbon and graphite. A stepwise variation of Ea is analysed using the selective energy transfer model where Ea is identified as the vibrational energy associated with an excitation of the chlorobenzene out-of-plane C-H bending mode. Variation of Ea with vibrational quantum number yields a vibrational frequency of 749 cm-1 and a value (-1.1 cm-1) for the anharmonicity term, which is characteristic of bending vibrational modes. Our analysis suggests that the reacting species are weakly adsorbed on the catalyst: heat of adsorption = -0.31 kJ mol-1. © 2007 Elsevier B.V. All rights reserved.
- Apparent activation energy
- Catalytic hydrodechlorination
- Heat of adsorption
- Selective energy transfer model