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In this work, soot oxidation was conducted over a series of Mn-X/γ-Al₂O₃ (M = Ce, Co and Cu) binary catalysts in a dielectric barrier discharge reactor. The soot conversion in the plasma–catalytic system was in the order of Mn/γ-Al₂O₃ (57.7%) > Mn-Co/γ-Al₂O₃ (53.9%) > Mn-Ce/γ-Al₂O₃ (51.6%) > Mn-Cu/γ-Al₂O₃ (47.7%) during the 30 min soot oxidation process at 14 W and 150 °C. Meanwhile, the doping of Ce, Co and Cu slightly improved the CO₂ selectivity of the process by 4.7% to 10.3% compared to soot oxidation over Mn/γ-Al₂O₃.It is worth to note that the order of CO₂ selectivity was in the opposite order with soot oxidation rate. The effects of discharge power, oxygen content in the carrier gas and reaction temperature on plasma–catalytic soot oxidation was systematically analyzed. The catalyst characterizations, including N₂ adsorption–desorption, X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction by H₂ and temperature-programmed desorption of O_2, were conducted to illustrate the reaction mechanisms of plasma–catalytic soot oxidation and reaction pathways.