Argon glow discharge plasma was applied for drying the impregnated Ni/SiO2 catalyst instead of the drying thermally. Such plasma treated catalyst significantly inhibits the coke formation from methane decomposition. The methane-derived carbon shows an improved reactivity against CO2. This can result in a better balance of coke formation and gasification by CO2 when the plasma-treated Ni/SiO2 catalyst is used for the CO2 reforming of methane.