(621bq) Copper/Vanadia/Titania Bifunctional Catalysts for Ammonia Remediation
NH3 is an important source of malodor associated with the transportation, processing and storage of organic and biological wastes. Power plants are also becoming an important source of NH3 malodor, and new diesel engine vehicles fitted with SCR systems are potential non-point source of ammonia. Vanadium oxides can catalyze many partial oxidation reactions including that of alkane, olefins and alcohols, and more recently that of the selective catalytic oxidation of NH3 to N2. This study explores a series of bifunctional catalysts based on copper-vanadia supported on titania for catalytic remediation of NH3 in air. Copper-vanadia on titania catalysts are more active than the vanadia catalysts for NH3 oxidation at low to medium temperatures. Both bifunctional and vanadia-titania catalysts can convert NH3 to N2 at room temperature without NOx formation, however NOx formation in the bifunctional catalysts occurred above 100°C. This suggests a different reaction pathway is operative compared to the vanadia-titania catalyst.
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