Catalytic Oxidation of NO to NO2 over a H-Mordenite Catalyst.

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Abstract
A study of the catalytic oxidation of NO to NO2 has been conducted in order to investigate the kinetics of the reaction. The reaction rate dependence of NO partial pressure (YNO .ltoreq. 600 ppm, ptot = 2.1 bar) was determined to be of first order. A Langmuir-Hinshelwood type dependence was obtained for oxygen, but since the change in oxygen concentration is very small the rate dependence can be regulated as pseudo-zero order. At temperatures above 200.degree. C the attainable conversion is limited by the thermodynamic equilibrium conversion, and the decomposition of NO2 must be taken into consideration in the model. The apparent pre-exponential factors and activation energies of the rate constants in the resulting model were fitted to experimental data by a least-squares nonlinear regresssion method. This was done in two different ways, individually to each set of data [mean value of individual fit: a1 = 4.3 mol (g s bar)-1, Ea1 = 33.4 kJ mol-1; a2 = 4750 mol (g s bar)-1, Ea2 = 89.0 kJ mol-1], and by fitting all data simultaneously [a1 = 7.1 mol (g s bar)-1, Ea1 = 36.2 kJ mol-1: a2 = 7840 mol (g s bar)-1, Ea2 = 91.8 kJ mol-1].

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