Simultaneous catalytic removal of NO, mercury and chlorobenzene over WCeMnOx/TiO2–ZrO2: Performance study of microscopic morphology and phase composition

Nitrogen oxides, mercury and chlorobenzene are important air pollutants emitted by waste incineration and other industries. Coordinated control of multiple pollutants has become an important technology for air pollution control. Through solid-phase structure control, the catalytic performance of the WCeMnO_x/TiO₂–ZrO₂ catalyst for simultaneous catalytic removal of NO, mercury and simultaneous removal of NO and chlorobenzene were improved. MnWO₄ improved the solid acidity of the catalyst and improved the catalytic activity at high temperature. The formation of Ce_0·75Zr_0·25O₂, Ce₂WO₆, Ce₂Zr₂O₇ and Ce₂Ti₂O₇ improved the catalytic activity at low temperature. The presence of TiOSO₄ would affect the valence of metal ions and the reduction of chemisorbed oxygen, thereby reducing the catalytic activity at low temperature. Within the same size range of nanoparticles, cyclic nanoparticles exposed more active sites due to their hollow structure, and their catalytic performance was better than spherical nanoparticles. The thickness of the circular nanoparticles of WCM/TZ-14 catalyst was about 14 nm, and the diameter was about 40 nm Ce_0.75Zr_0.25O₂ and MnWO₄ were also present in the phase composition. Therefore, it exhibited the best performance for simultaneous catalytic removal of NO, mercury and simultaneous removal of NO and chlorobenzene. The coincidence temperature window was 347–516 °C. Finally, WCM/TZ-14 catalyst followed both E-R and L-H mechanisms in the NH₃-SCR reaction.