Fig. 7
NOx removal efficiencies of the synthesized SCR catalysts according to tungsten content measured in the temperature range 150–450 °C a NOx conversion and b N2 selectivity and N2O concentration. Reaction conditions: [NOx] = 300 ppm, [NH3] = 300 ppm, [SO2] = 0 or 300 ppm, [O2] = 5%, balance N2, total flow 500 sccm, and the gas hourly space velocity (GHSV) = 60,000 h−1