In Situ FTIR Studies of the Selective Catalytic Reduction of NO by C₃H₆ over Pt/Al₂O₃

ISSN： 0021-9517

Source： Journal of Catalysis, Vol.184, Iss.2, 1999-06, pp. : 377-389

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Abstract

The selective catalytic reduction (SCR) of nitric oxide (NO) by propylene (C₃H₆) over a 0.8 wt% Pt/Al₂O₃ catalyst was studied by the use of in situ Fourier transform infrared (FTIR) spectroscopy. Spectra of both the Pt/Al₂O₃ catalyst as well as the bare Al₂O₃ support were collected during the course of this study. NO adsorption resulted in the formation of nitrate species associated with the Al₂O₃ support, as well as surface NO species associated with Pt. Similarly, C₃H₆ adsorption resulted in the formation of carboxylate species associated with Al₂O₃, as well as surface CO associated with Pt. Finally, experiments conducted with the reactive NO–C₃H₆–O₂ mixture resulted in the formation of surface cyanide (–CN) and isocyanate (–NCO) species. The origin and reactivity of these species is discussed in view of their potential involvement as intermediates in the hydrocarbon–SCR reaction.