Temperature and conversion dependence of selectivities in the oxidative coupling of methane on La2O3 catalysts

Abstract The C 2 + selectivity has been found to be highly dependent on reaction conditions such as conversion of reactants and temperature. For all the La 2 O 3 catalysts investigated, the C 2 + selectivity decreases linearly with methane conversion at a given temperature. The C 2 + selectivity, plotted as a function of temperature and measured at isoconversion of methane, presents a maximum in the range 850–900°C. The best C 2 + yield is obtained for total conversion of oxygen at a temperature slightly higher than 850°C.