Identification of the active sites on CeO2-WO3 catalysts for SCR of NOx with NH3: An in situ IR and Raman spectroscopy study

- The redox sites cycle are mainly based on the ceria fluorite cubic phase.
- The acid sites cycles are come from the Brønsted acid sites of Ce2(WO4)3.
- The [WO4] or [WO6] units could be the active sites during the reaction.
- The active NHx species react with NO or adsorbed NO2.