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Ce modified MnO x -based catalysts have attracted much attention due to its high activity for selective catalytic reduction of NO x  by NH 3  (NH 3 -SCR) at low-temperatures. However, the most important role of Ce on the NH 3 -SCR performance of MnO x -based catalysts has not been confirmed. Herein, the typical Ce-Mn/TiO 2  catalyst was synthesized through incipient-wetness impregnation method, the positive role of Ce on Ce-Mn/TiO 2  catalyst in the NH 3 -SCR process was revealed by combining different activity tests (including NO oxidation and NH 3  oxidation) and characterizations (including XRD, XPS and He-TPDMS experiments). It was found that the introduction of Ce can promote the dispersion of MnO x  on TiO 2  support. Meanwhile, the doping of Ce in MnO x  can also increase the content of Mn 4+  species. The Mn 4+  species plays a crucial role in NO oxidation reaction, which can trigger the “Fast SCR” reaction and promote the conversion of NO x . This work provides insight into the catalyst design for NH 3 -SCR process at low-temperature.

Effects of Ce over TiO2 supported MnOx-based Catalyst for NOx Reduction by Ammonia