Abstract:
Catalytic combustion of volatile organic compounds (VOCs), present in trace concentrations from effluent streams, is a promising air abatement technology. The oxidation of diethylamine (DEA) has been investigated over three types of commercial catalysts, Pt, Pd, and Rh supported on ceramichoneycombed monolith. The palladium (Pd) catalyst was found to be the most active catalyst in terms of DEA oxidation. The conversion to CO2 becomes appreciable in the range of 250 - 280 °C while the percentage of conversion greater than 95 was obtained at about 320 °C. The reaction rate was depended on diethylamine concentration whereas the oxygen concentration did not affect to the reaction rate. By increasing DEA concentration, the reaction rate was increased. The reaction rate was also increased with increasing the reaction temperature. The reaction order with respect to DEA concentration was in the range of 0 to 1 whereas it was found to be close to zero with respect to oxygen concentration. The apparent activation energies of the reaction over the Pd catalyst were determined to be 18.80, 9.85, and 2.14 kcal/mole in the chemical kinetic, pore diffusion, and bulk mass transfer regions, respectively.
