The kinetics of methane oxidative coupling (OCM) was studied using 1 g of Na-Mn203 catalyst at 1073 to 1123 K, in an integral flow reactor (1.d. = 10 mm), at atmospheric pressure with methane and oxygen partial pressures of 0.27 and 0.13 bar, respectively, so that the ratio of CH4 to O2 was 2. The flow rate range was 50 to 200 ml/min. The kinetic data were analyzed by the Rideal-redox type of rate equation assuming the methyl radical and active surface oxygen to be the steady-state intermediates. Oxidation and reduction rate constants (KO,, &d) for methane consumption were calculated from experimental catalysis results by computer simulation using the multiple least squares method. The activation energies at rate constants KO, and Kred for this type of catalyst were reported as 43.26 and 62.2 kcal/mol, respectively.
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