NO TPD and H2-TPR studies for characterisation of CuMOR catalysts The role of Si/Al ratio, copper content and cocation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Catalysis B: Environmental Année : 1997

NO TPD and H2-TPR studies for characterisation of CuMOR catalysts The role of Si/Al ratio, copper content and cocation

Résumé

NO TPD, H2-TPR and XRD have been used to characterise copper-exchanged mordenites with different Si/Al ratios, copper contents and cocations. The results showed that copper is mainly in the form of isolated Cu2+ ions in CuMOR catalysts with copper exchange ?20%, whereas at higher copper exchange CuO species are also present. These results were obtained with H and Na as cocation and were achieved by changing either the catalyst Si/Al ratio or the copper content. The data also indicate that the cocation mainly affects copper location and that copper is more easily reduced in sodium form catalysts than in protonic form. It was found that the isolated Cu2+ ions are the most effective species for NO adsorption and the most active species for NO SCR.

Dates et versions

hal-00179227 , version 1 (15-10-2007)

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Cidalia Torre-Abreu, Maria Filipa Ribeiro, Carlos Henriques, Gerard Delahay. NO TPD and H2-TPR studies for characterisation of CuMOR catalysts The role of Si/Al ratio, copper content and cocation. Applied Catalysis B: Environmental, 1997, 14, pp.261-272. ⟨10.1016/S0926-3373(97)00028-3⟩. ⟨hal-00179227⟩
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