Catalytic combustion of lean methane-air mixtures was studied on supported iron oxide and platinum monolith catalysts. Flameless catalytic combustion was investigated in the temperature range 600-900 degrees C, GHSV up to 10 000 h(-1), and methane concentration in initial gas mixture 1-9 vol%. It was shown that under certain process conditions complete combustion of methane at similar to 4.5 vol% inlet methane concentration occurs.