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This paper presents a two-stage hybrid plasma catalyst system for toluene decomposition in air.It consists of a dielectric barrier discharge reactor and Mn-based composite oxides catalysts.Experimental results show that removal efficiency of toluene was 10%by only plasma,but a 100%destruction efficiency as well as 100%ozone removal was achieved by plasma catalysis at a specific energy density of 28.8J/L.The catalytic decomposition efficiency of toluene and ozone produced in the first stage is in the following order:NTP+Mn-Co/A1>NTP+Mn-Ce/Al>NTP+Mn-Ni/A1>NTP.Compared to other catalysts coupled with non-thermal plasma in a two-stage plasma catalytic reactor,the alumina-supported Mn-based composite oxides catalysts showed a better performance for toluene and ozone removals,especially the Mn-Co/Al catalyst.