Multi-component zirconia-titania mixed oxides: Catalytic materials with unprecedented performance in the selective catalytic reduction of NOx with NH3 after harsh hydrothermal ageing - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Catalysis B: Environmental Année : 2011

Multi-component zirconia-titania mixed oxides: Catalytic materials with unprecedented performance in the selective catalytic reduction of NOx with NH3 after harsh hydrothermal ageing

Résumé

Standing harsh hydrothermal treatment (∼10% H2O, ∼1050 K) is a prerequisite for deNOx catalysts of tomorrow in diesel exhaust gas treatment. New catalytic materials composed of Mn-, Fe- and Ce-ZrTiSiW mixed oxide were evaluated in the selective catalytic reductionNObyNH3 at high gas hourly space velocity (330,000mLg−1 h−1) and after high temperature hydrothermal treatment, 16 h at 1023K in H2O/air (10/90). They were compared with a Fe-ZSM5 SCR catalyst treated in thesamemanner. CeZrTiSiW exhibits the best performance and keeps high NO conversion (>80%) from 630 to 800 K. It is stable and fully selective to N2 up to 823 K. It is more active and selective than Fe-ZSM5. The presence of NO2 in the feed (NO2/NO = 0.85) boosts the NO conversion by shifting the light-off temperature (50% NO conversion) from 560K to 460 K.
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Dates et versions

hal-00639375 , version 1 (10-11-2011)

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Nathalie Marcotte, Bernard Coq, Claire Savill-Jowitt, Philippe Bichon, Romain Cavalier, et al.. Multi-component zirconia-titania mixed oxides: Catalytic materials with unprecedented performance in the selective catalytic reduction of NOx with NH3 after harsh hydrothermal ageing. Applied Catalysis B: Environmental, 2011, 105, pp.373-376. ⟨10.1016/j.apcatb.2011.04.022⟩. ⟨hal-00639375⟩
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