Effectively promote catalytic performance by adjusting W/Fe molar ratio of FeWx/Ce0.68Zr0.32O2 monolithic catalyst for NH3-SCR

• Adjusting W/Fe molar ratio evidently improved SCR performance of FeWx/Ce0.68Zr0.32O2 catalyst.
• An optimal W/Fe ratio provided high NH3-SCR performance and wide reaction window.
• FeW1.03/Ce0.68Zr0.32O2 showed an excellent NOx conversion and N2 selectivity.
• The catalyst had a low dependence on the GHSV in a wide temperature range.

FeWx/Ce0.68Zr0.32O2 (x = 0, 0.35, 0.7, 1.03, 1.38) catalysts with different molar ratios (x) of W/Fe were prepared for NH3-SCR. The experimental results showed that catalytic performances of catalysts were obviously improved by adjusting the molar ratio of W/Fe. FeW1.03/Ce0.68Zr0.32O2 catalyst with W/Fe of 1.03 displayed the best catalytic performance, it could obtain higher than 95% NOx conversion and nearly 100% N2 selectivity in the temperature range of 250–435 °C. The characterization results indicated that more active species of Fe3+, chemical adsorbed oxygen species and surface acid sites would together contribute to the excellent NH3-SCR performance of FeW1.03/Ce0.68Zr0.32O2 catalyst.

Figure optionsDownload as PowerPoint slide