Spectroscopic evidence for the mode of action of alkali promoters in Pt-catalyzed de-NOx chemistrySpectroscopic evidence for the mode of action of alkali promoters in Pt-catalyzed de-NOx chemistry Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-312007enThe interaction of NO with sodium-dosed Pt(Na)/γ-Al2O3 catalysts was studied by means of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). With increasing sodium loading, pronounced and progressive red shifts of the Nsingle bondO stretching frequency associated with molecular NO adsorbed on the Pt component were observed. This decrease in ν(NO) correlates with enhancement of NO dissociation at higher temperatures on Na-promoted Pt catalysts under conditions where clean Pt is almost ineffective. These spectroscopic observations provide a clear and consistent explanation for the recently reported very strong promotion by alkalis of the performance of supported Pt catalysts in de-NOx chemistry http://creativecommons.org/licenses/by/4.0/Applied Catalysis B: Environmental761-2101-106 Koukiou S. Konsolakis Michail Κονσολακης Μιχαηλ Lambert Richard M. Gentekakis Ioannis Γεντεκακης Ιωαννης Elsevier Infrared spectroscopy Platinum Sodium Al2O3 NO adsorption