Synergistic Promotion Effect between NOx and Chlorobenzene Removal on MnOx-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 N-2 selectivity below 300 degrees 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 degrees C in the presence of O-2. 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 degrees C and CB oxidation at 200-300 degrees C. The side reactions mainly occurred above 200 degrees C, which is suppressed by the coverage and activation of CB on catalyst surface.