The effective promotion of trace amount of Cu on Ce/WO3-ZrO2-TiO2 monolithic catalyst for the low-temperature NH3-SCR of NOx

The selective catalytic reduction of NOx with NH3 (NH3-SCR) activity of 0.10g/g CeO2/WO3-ZrO2-TiO2 (Ce/WZT) in low temperature range was greatly enhanced by the addition of 0.00010g/g Cu (Cu/Ce mass ratio=1:1000). The temperature of complete NOx conversion (T-90) decreased as much as 36 degrees C (from 263 degrees C to 227 degrees C) under a gas hourly space velocity (GHSV) of 30000h(-1). XPS, NH3/O-2-TPD, H-2-TPR, XRD, and FTIR characterizations revealed that the interaction between Cu and Ce, more active oxygen species, stronger NH3 and NO oxidation ability, better redox ability, together with the abundant BrOnsted acid sites contributed to better catalytic activity of 0.00010g/g Cu-0.10g/g Ce/WO3-ZrO2-TiO2 (CC/WZT) catalyst at low temperatures.