Abstract: Zeolites partially exchanged with copper, in particular faujasites, in which the copper does not largely occupy the small cages (for example the sodalite cages of the faujasites), are used as non-nitrogen-protoxide-generating SCR catalysts. Particular attention is drawn to certain mixed rare-earth/copper zeolites. The selectivity of the reduction of NOx to N2 is correlated with the TPR diagram of the catalysts.
Type:
Grant
Filed:
October 30, 1998
Date of Patent:
April 24, 2001
Assignee:
Grand-Paroiesse S.A.
Inventors:
Bernard Coq, Gerard Delahay, Francois Fajulas, Bernard Neveu, Jean-Bernard Peudpiece, Stéphane Kieger
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