Characterization of Na2O–MnOx–CuOy catalysts for the oxidative dimerization of methane
Abstract
Catalytic and structural effects of copper incorporation into Na2O–MnOx catalysts used for the oxidative dimerization of methane have been studied by catalytic testing, X-ray diffraction (XRD), temperature-programmed reduction (TPR) and magnetic susceptibility measurements. Catalysts containing copper revealed an increase in the C2 hydrocarbon yield based on interactions between the copper and manganese ions within a complex oxide structure. The state of the transition-metal ions is explained by the equilibrium CuI+ MnIV⇌ CuII+ MnIII, depending on the Mn/Cu ratio and the gas-phase composition.