Synergistic Promotion Effect between NO_x and Chlorobenzene Removal on MnO_x–CeO₂ Catalyst

Developing new technologies for the simultaneous removal of NOx and dioxins from metallurgical facility and waste incinerator emissions remains challenging. Here, we present a new synergistic improvement effects of NOx and chlorobenzene (CB) on the MnOx–CeO2 catalyst. CB promoted both the NOx conversion and N2 selectivity below 300 °C during the NOx reduction process, in which the MnOx–CeO2 catalyst caused the undesired side reactions due to the over-oxidation of NH3. Meanwhile, NOx and NH3 promoted the CB oxidation activity above 100 °C in the presence of O2. On the basis of the diffuse reflectance infrared Fourier transforms and kinetic studies, the promotion was due to the separation of the MnOx–CeO2 catalyst into different temperature windows: NOx reduction at 100–200 °C and CB oxidation at 200–300 °C. The side reactions mainly occurred above 200 °C, which is suppressed by the coverage and activation of CB on catalyst surface.