Na-ZSM-5, performed using both silicone oil (s.o.) and (16:3:1) methanol:ethanol:water (m.e.w.), as ‘‘non-penetrating’’ and ‘‘penetrating’’ pressure transmitting media, respectively. In the range from ambient pressure (Pamb) to 6.2 GPa, the reductions of a, b, c, and V observed in s.o. are: 6.4, 6.3, 6.9 and 18.5%,respectively. From Pamb to 7.4 GPa, a unit-cell volume reduction of about 14.6% is observed for Na-ZSM-5 compressed in m.e.w., and the corresponding reductions of a, b, and c cell parameters are 6.3, 4.6, and 4.5%, respectively. In both cases no phase transitions are observed and the unit cell parameters of ambientconditions are recovered upon decompression. The complete structural refinements relative to the experiments performed in m.e.w. up to 1.6 GPa reveal a strong increase in the extra-framework content – with the penetration of additional water/alcohols molecules in the partially occupied extra-framework sites of as-synthesized Na-ZSM-5. This P-induced penetration, which does not induce any cell volumeexpansion, is only partially reversible, since a fraction of the extra-molecules remains in the channels upon decompression. Our results show that Na-ZSM-5 is the softest microporous material among those so far compressed in s.o. Moreover, its compressibility is higher in s.o. than in m.e.w. (K0 = 18.2(6) GPa,K0 = 4 (fixed) and 28.9(5) GPa, K0 = 4 (fixed), respectively). This can be ascribed to the penetration of the extra-water/alcohol molecules, which contribute to stiffen the structure and to contrast the channel deformations.

Elastic behavior of MFI-type zeolites: 1-Compressibility of Na-ZSM-5in penetrating and non-penetrating media / Arletti, R.; Vezzalini, Maria Giovanna; Morsli, A.; Di Renzo, F.; Dmitriev, V.; Quartieri, S.. - In: MICROPOROUS AND MESOPOROUS MATERIALS. - ISSN 1387-1811. - STAMPA. - 142:2-3(2011), pp. 696-707. [10.1016/j.micromeso.2011.01.022]

Elastic behavior of MFI-type zeolites: 1-Compressibility of Na-ZSM-5in penetrating and non-penetrating media

Arletti R.;VEZZALINI, Maria Giovanna;
2011

Abstract

Na-ZSM-5, performed using both silicone oil (s.o.) and (16:3:1) methanol:ethanol:water (m.e.w.), as ‘‘non-penetrating’’ and ‘‘penetrating’’ pressure transmitting media, respectively. In the range from ambient pressure (Pamb) to 6.2 GPa, the reductions of a, b, c, and V observed in s.o. are: 6.4, 6.3, 6.9 and 18.5%,respectively. From Pamb to 7.4 GPa, a unit-cell volume reduction of about 14.6% is observed for Na-ZSM-5 compressed in m.e.w., and the corresponding reductions of a, b, and c cell parameters are 6.3, 4.6, and 4.5%, respectively. In both cases no phase transitions are observed and the unit cell parameters of ambientconditions are recovered upon decompression. The complete structural refinements relative to the experiments performed in m.e.w. up to 1.6 GPa reveal a strong increase in the extra-framework content – with the penetration of additional water/alcohols molecules in the partially occupied extra-framework sites of as-synthesized Na-ZSM-5. This P-induced penetration, which does not induce any cell volumeexpansion, is only partially reversible, since a fraction of the extra-molecules remains in the channels upon decompression. Our results show that Na-ZSM-5 is the softest microporous material among those so far compressed in s.o. Moreover, its compressibility is higher in s.o. than in m.e.w. (K0 = 18.2(6) GPa,K0 = 4 (fixed) and 28.9(5) GPa, K0 = 4 (fixed), respectively). This can be ascribed to the penetration of the extra-water/alcohol molecules, which contribute to stiffen the structure and to contrast the channel deformations.
2011
142
2-3
696
707
Elastic behavior of MFI-type zeolites: 1-Compressibility of Na-ZSM-5in penetrating and non-penetrating media / Arletti, R.; Vezzalini, Maria Giovanna; Morsli, A.; Di Renzo, F.; Dmitriev, V.; Quartieri, S.. - In: MICROPOROUS AND MESOPOROUS MATERIALS. - ISSN 1387-1811. - STAMPA. - 142:2-3(2011), pp. 696-707. [10.1016/j.micromeso.2011.01.022]
Arletti, R.; Vezzalini, Maria Giovanna; Morsli, A.; Di Renzo, F.; Dmitriev, V.; Quartieri, S.
File in questo prodotto:
File Dimensione Formato  
MicropMeso 2011.pdf

Accesso riservato

Tipologia: Versione dell'autore revisionata e accettata per la pubblicazione
Dimensione 1.52 MB
Formato Adobe PDF
1.52 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/649206
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 22
social impact