A stable catalyst for simultaneous catalytic removal of nitrogen oxide and toluene at low temperature

Simultaneous catalytic removal of nitrogen oxide and volatile organic compounds at low temperature is a challenge since these two pollutants have a competitive effect for the catalytic active site. This work has compared the different behaviors of V/TiO ₂ and CeV/TiO ₂ in separate and simultaneous catalytic removal of NO and toluene. Both the catalysts have been detailly characterized and compared. The catalytic oxidation of toluene obviously disturbed the catalytic reduction of NO by V/TiO ₂ . NO removal was decreased from 99% to 72% at 250°C. In comparison, the toluene only decreased the NO removal of CeV/TiO ₂ from 95% to 85%. From the viewpoint of toluene, the NO slightly decreased the toluene removal of V/TiO ₂ but hardly affected the toluene removal of CeV/TiO ₂ . The more stable performance of CeV/TiO ₂ was attributed to its lower adsorption energies/abilities for various pollutants and derived intermediates.