The formation of a solid carbon phase (soot) during the production of synthesis gas in the combustion process of superrich methane mixtures was experimentally studied in a static apparatus, rapid compression machine and in a rocket-engine based flow reactor. It was shown experimentally that admixtures of steam (5-15 wt % of methane mass) suppress the formation of soot during the burning of methane-oxygen mixtures with an excess oxidant factor of alpha a parts per thousand yen 0.35. The influence of the combustion regimes on the yield of soot was examined, and its properties were studied.