Abstract
The influence of vanadium content on the catalytic activity of Ti-V-P-O cctalysts for the selective reduction of nitric oxide with ammonia in the presence of oxygen was studied in a pseudoadiabatic reactor. The catalytic activity is related to the presence of well dispersed vanadium-oxygen species interacting with the titanium dioxide surface. Other proportionally less active configurations of vanadium species were detected on the catalyst surface such as α- and β-VOPO 4 (shown by X-ray diffraction). The vanadium species named “paracrystalline V 2O 5” revealed by (laser Raman spectroscopy) was not active and when selectively extracted the activity per gram of catalyst increased, probably owing to the cleaning of plugged pores.
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