Contribution of multi-metal oxides based on SrMnO 3 for the enhanced formation of Ov on chlorobenzene degradation: performance and mechanism

The degradation of chlorinated volatile organic compounds (CVOCs) using conventional chalcogenide catalyst is often hindered by the accumulation of chlorine species and the loss of active sites. Although SrMnO ₃ improves the degradation efficiency of pollutants by inhibiting chlorine species accumulation due to its high thermal stability and oxygen mobility, chlorine toxicity remains a concern. In this work, a multi-metal oxide based on SrMnO ₃ was synthesized by hydrothermal method, with Ce introduced to increase surface deficiency, thereby exposing more active sites. The influences of catalyst dosage, relative humidity, pollutant concentration and airspeed on chlorobenzene (CB) degradation were systematically investigated, with the highest CB removal efficiency achieved by T ₉₀  = 247 ℃, T ₉₅  = 269 ℃, mineralization rate = 71%. The catalytic mechanism was investigated with systematical characterizations and the possible degradation pathways of CB were also inferred with GC-MS. This study would provide new insights and ideas for the design and synthesis of chalcogenide-based multi-metal oxide catalyst.