Degradation of o-dichlorobenzene by DBD-NTP co-modified titanium gel catalyst

•NTP-catalytic system improves pollutant degradation efficiency and CO2 selectivity.•CuMnTiOx has higher activity than CeMnTiOx in the NTP-catalytic system.•Discharge determines the degradation of o-DCB and catalytic activity determines SCO2 and the degradation of O3.•Cu doping increases the lifetime of the catalyst.