Five different samples of (Ba, Sr)-exchanged zeolite A, with a residual Na content ranging between 0.14 and 0.23 meq g-1, were prepared by cation exchange so as to cover the whole composition range between the pure Ba- and Sr-end terms. In order to investigate the thermal conversion of these samples into monoclinic celsian solid solutions, thermal treatments in the temperature range 200–1200 C for times up to 5 h were performed and the obtained products characterized by room temperature XRD. The results of these investigations were discussed in the light of previous studies concerning the thermal transformations of Ba-exchanged and Sr-exchanged zeolite A. Interesting results were obtained. In particular the total conversion of a sample of (Ba, Sr)-exchanged zeolite A, with a Sr2+ equivalent fraction of 0.14 and a Na+ residual content of 0.18 meq g1, in the monoclinic polymorph of (Ba, Sr)Al2Si2O8 solid solution was attained by a 5 h thermal treatment at 1100 C.

Monoclinic (Ba, Sr)-celsian by thermal treatment of (Ba, Sr)-exchanged zeolite A

LIGUORI, BARBARA;COLELLA, CARMINE
2010

Abstract

Five different samples of (Ba, Sr)-exchanged zeolite A, with a residual Na content ranging between 0.14 and 0.23 meq g-1, were prepared by cation exchange so as to cover the whole composition range between the pure Ba- and Sr-end terms. In order to investigate the thermal conversion of these samples into monoclinic celsian solid solutions, thermal treatments in the temperature range 200–1200 C for times up to 5 h were performed and the obtained products characterized by room temperature XRD. The results of these investigations were discussed in the light of previous studies concerning the thermal transformations of Ba-exchanged and Sr-exchanged zeolite A. Interesting results were obtained. In particular the total conversion of a sample of (Ba, Sr)-exchanged zeolite A, with a Sr2+ equivalent fraction of 0.14 and a Na+ residual content of 0.18 meq g1, in the monoclinic polymorph of (Ba, Sr)Al2Si2O8 solid solution was attained by a 5 h thermal treatment at 1100 C.
File in questo prodotto:
File Dimensione Formato  
MMM 2010.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: Accesso privato/ristretto
Dimensione 841.49 kB
Formato Adobe PDF
841.49 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/365820
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 29
social impact