The adsorption of NO at 80 degrees C on Cu-overexchanged ZSM-5 (Si/Al = 80) has been investigated in a flow apparatus. The formation of N2O during a transient phase was observed after He pretreatment of the zeolite at 550 degrees C. A negligible amount of N2O was detected, in contrast, from Oz pretreated zeolite. The formation of N2O has been associated to the reoxidation from Cu+ to Cu2+ Of a fraction (about 40%) of copper in the zeolite. The redox chemistry in NO adsorption at low temperature can be related to the activity of Cu-ZSM-5 zeolite in NO decomposition.
Transient behaviour of Cu-overexchanged ZSM-5 catalyst in NO decomposition / R., Pirone; E., Garufi; P., Ciambelli; Moretti, Giuliano; G., Russo. - In: CATALYSIS LETTERS. - ISSN 1011-372X. - 43:3-4(1997), pp. 255-259. [10.1023/a:1018967328681]
Transient behaviour of Cu-overexchanged ZSM-5 catalyst in NO decomposition
MORETTI, GIULIANO;
1997
Abstract
The adsorption of NO at 80 degrees C on Cu-overexchanged ZSM-5 (Si/Al = 80) has been investigated in a flow apparatus. The formation of N2O during a transient phase was observed after He pretreatment of the zeolite at 550 degrees C. A negligible amount of N2O was detected, in contrast, from Oz pretreated zeolite. The formation of N2O has been associated to the reoxidation from Cu+ to Cu2+ Of a fraction (about 40%) of copper in the zeolite. The redox chemistry in NO adsorption at low temperature can be related to the activity of Cu-ZSM-5 zeolite in NO decomposition.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
