Simultaneous catalytic elimination of CO, toluene and NH3 over multifunctional CuCeZr based catalysts

Catalytic oxidation technology is a promising strategy to eliminate carbon monoxide (CO), volatile organic compounds (VOC) and other emissions from industrial boilers and to address ammonia (NH 3 ) escape. Herein, we demonstrate the potential of copper-cerium-zirconium mixed oxides or those supported on TiO 2 or ZSM-5 substrates for the simultaneous catalytic removal of CO, toluene and NH 3 . Among them, CuCeZr/ZSM-5 exhibits the best co-processing ability for mixed gases. In situ infrared spectroscopy analyses suggest that there is a competitive adsorption among CO, toluene and NH 3 , and the inhibition is in descending order of toluene＞CO＞NH 3 . Based on the physical-chemical characterizations, the Cu-Ce interfacial structure plays an important role in CO ignition at low temperatures. More importantly, the abundant acidic sites on the ZSM-5 support can improve the stability of adsorbed NH 3 at high temperatures, resulting in the best NH 3 catalytic oxidation performance of CuCeZr/ZSM-5 with no secondary pollutants of NO x . This study provides a strategy for the catalyst design to eliminate multiple pollutants targeting the properties of pollutants.