Dry reforming of methane was investigated by non-thermal plasma coupled with different metal oxides: BaO, La₂O₃, ZnO, CaO, α-Al₂O₃, MgO, γ-Al₂O₃, TiO₂ and CeO₂. The deposited power was fixed at 8 W and the total gas flow at 40 mL.min⁻¹ (75 % helium as diluent). Electrical characterization showed that the CO₂ and CH₄ conversions were enhanced (from 5.6 to 30.6 % for CH₄ and from 1.9 to 16.1 % for CO₂) when the permittivity was reduced from 2903 to 4.1, respectively. Methanol selectivities were favored for the oxides presenting low permittivities, indicating that reaction is favored under a low electric field, thus low density of reactive species. The effect of reaction temperature was evaluated on MgO catalyst. The increase of the temperature favored CH₄ conversion, while reducing methanol selectivity. The oxide characterization by TGA revealed the re-hydroxylation of MgO at low temperature, which was correlated to the improved oxygenated compounds selectivities.