MANGANESE CATALYSTS FOR METHANE TRANSFORMATIONS IN THE ABSENCE OF OXYGEN

The catalytic activity and physicochemical properties of supported man ganese oxide catalysts were studied. It was found that MnOx/silica and MnOx/silicaalumina systems catalysed methane coupling reaction in the absence of oxygen while MnOx supported on alumina was inactive. Catal ytic activity depends on the nature of redox centres of the MnOx surfa ce phase. Mn2O3 phase present on alumina catalyses both hydrocarbons f ormation from methane and their pyrolysis. Active sites of braunite ph ase, formed on silica and silicaalumina supports, are able to activate only C-II bonds of the hydrocarbons and catalyse methane transformati on into C-2-C-3 hydrocarbons.