METHOD FOR THE PRODUCTION OF AN SCR-ACTIVE ZEOLITE CATALYST, AND SCR-ACTIVE ZEOLITE CATALYST

摘要

A method for producing an SCR-active zeolite catalyst as well as a zeolite catalyst that is produced accordingly are disclosed. In order to produce said catalyst, an Fe ion-exchanged zeolite is initially subjected to a first temperature treatment (3) within a range of 300 to 600°C in a reducing hydrocarbon atmosphere such that the oxidation state of the Fe ions decreases and/or the dispersity of the Fe ions on the zeolite increases, whereupon the reduced zeolite is subjected to a second temperature treatment (4) within a range of 300 to 600°C in an oxidizing atmosphere such that hydrocarbon residues or carbon residues are oxidatively removed, the zeolite being calcined (2) to obtain a catalyst material during the first and the second temperature treatment. Said production method allows iron contained in the zeolite to be stabilized in an oxidation state of less than +3 and/or the dispersity of the Fe ions on the zeolite to be permanently increased such that a high SCR activity is achieved within a temperature range of less than 300°C.