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Abstract
The selective catalytic reduction (SCR) of NO x in excess of oxygen using ethanol as reducing agent on silver/alumina was studied by coupling in situ FTIR spectroscopy and mass spectrometry. A comparison with the same reaction on bare alumina permitted us to show the connection between the presence of silver and isocyanate species on a catalyst. Then, a detailed investigation concerning these groups was undertaken to understand their formation, their localization, and their reactivity in order to propose the pathway of the NO x SCR into N 2. Three elemental sequences are suggested explaining, first, the formation of silver cyanide and its transformation into Al 3+NCO, then isocyanates hydrolysis into ammonia, and finally the reaction of the latter species with NO in the presence of oxygen giving rise to nitrogen.
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