Brief description: Essentially new effective autothermal technology of non-catalytic conversion of natural and associated gases to syngas has been proposed, which is based on surface combustion of hydrocarbons in permeable bulk matrices. Surface combustion of hydrocarbons near the inner surface of bulk matrix, which is permeable to the gas mixture, provides recuperation of considerable part of the conversion products heat, due to intensive exchange of the flame front with the surface. Together with the absence of IR irradiation losses in the closed matrix bulk, the combustion limits are expanded considerably, thus allowing conversion of very rich hydrocarbon mixtures to syngas with almost thermodynamically equilibrium yield in non-catalytic gas phase process.