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Article Dans Une Revue Catalysis Communications Année : 2005

Selective catalytic reduction of nitric oxide with ammonia on copper (II) ion-exchanged offretite

Résumé

Copper K-offretite catalysts prepared by ion exchange were characterized by XRD, H2-TPR and evaluated in the selective catalytic reduction of NO (NO-SCR) by ammonia. Despite several successive exchanges, the quantity of copper introduced remains low and the exchange ratio does not exceed 50%. The NO conversion profiles have a sigmoid curve shape. Full NO conversion in N2 is reached above 340 C at a volume space velocity of 332,000 h 1. N2O formation at low temperature is due to the presence of small oxide particles generated by the successive copper exchanges during the preparation. The presence of K ions ‘‘blocks'' the cancrinite access to copper ions and maintains the deNOx efficiency over the whole range of temperature.

Domaines

Catalyse

Dates et versions

hal-00178252 , version 1 (10-10-2007)

Identifiants

Citer

Walid Arous, Hassib Tounsi, Samir Djemel, Abdelhamid Ghorbel, Gerard Delahay. Selective catalytic reduction of nitric oxide with ammonia on copper (II) ion-exchanged offretite. Catalysis Communications, 2005, 6, pp.281-285. ⟨10.1016/j.catcom.2005.01.009⟩. ⟨hal-00178252⟩
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