Synergistic catalytic elimination of NO, mercury and chlorobenzene over WCeMnOx/TiO2-ZrO2: Performance study of pore structure

Abstract

The catalytic performance of synergistic catalytic elimination of NO, mercury and chlorobenzene for WCeMnOx/TiO2-ZrO2 was improved by controlling the pore structure. The formation of micron-sized macropores made the catalyst structure looser, and the transparent macropores helped the catalyst expose more active sites. At low temperature, -NH2* reacted with monodentate nitrite and bidentate nitrate, and NH4+ reacted with gas phase NO to generate N2 and H2O. At high temperature, NH4+ reacted rapidly with gas phase NO. The reaction process of catalytic oxidation of Hg0 was that gaseous Hg0 was adsorbed on the catalyst surface and then oxidized to Hg2+. For the catalytic degradation of chlorobenzene, phenols and HCl were generated firstly, and then phenols and hydroxyl groups reacted to form maleate, bidentate carbonate and carbonate species. The maleate and bidentate carbonate degraded to form carbonate, and the carbonate degraded to produce CO2 and H2O.