Novel MnOx-CeO2 nanosphere catalyst for low-temperature NH3-SCR.

A novel MnO x -CeO 2 nanosphere catalyst with assembled structure from tiny particles was prepared and tested towards low-temperature NH 3 -SCR. A superior deNO x performance compared to that obtained over the catalyst composed of MnO x supported on CeO 2 was obtained. A good resistance to high space velocity and SO 2 present in the feed and an excellent stability (no deactivation was observed during 100-h of testing at 150 °C) were obtained. The characterization results suggested that the higher specific surface area, better redox behavior and larger concentration of surface active oxygen species were responsible for the above mentioned excellent performance. The results of the present study suggest that control of catalyst morphology can be an effective strategy to upgrade low-temperature NH 3 -SCR performance. [ABSTRACT FROM AUTHOR]