By X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger spectroscopy (XAES) it is shown that Cu (II)ions exchanged in ZSM-5 and Y zeolites are easily reduced, in vacuum and under X-ray irradiation, to Cu (I). This process is faster for Cu (II) ions in ZSM-5. Dinitrogen adsorption measurements at 273 K have been performed after pretreatments of as prepared samples both in vacuum and in O 2 at 788 K. Only on Cu-ZSM-5 zeolites with Cu exchange levels close to 100% we have measured a relatively strong and irreversible adsorption of dinitrogen.
XPS and adsorption of dinitrogen studies on copper-ion-exchanged ZSM-5 and Y zeolites / Moretti, Giuliano; G., Minelli; Porta, Piero; P., Ciambelli; P., Corbo. - STAMPA. - 98:(1995), pp. 69-70. (Intervento presentato al convegno Zeolite Science 1994: Recent progress and discussion tenutosi a Garmisch-Partenkirchen, Germany nel July 17-22, 1994).
XPS and adsorption of dinitrogen studies on copper-ion-exchanged ZSM-5 and Y zeolites
MORETTI, GIULIANO;PORTA, Piero;
1995
Abstract
By X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger spectroscopy (XAES) it is shown that Cu (II)ions exchanged in ZSM-5 and Y zeolites are easily reduced, in vacuum and under X-ray irradiation, to Cu (I). This process is faster for Cu (II) ions in ZSM-5. Dinitrogen adsorption measurements at 273 K have been performed after pretreatments of as prepared samples both in vacuum and in O 2 at 788 K. Only on Cu-ZSM-5 zeolites with Cu exchange levels close to 100% we have measured a relatively strong and irreversible adsorption of dinitrogen.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
