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

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.04.026· OSTI ID:21580120

Quartieri, Simona ^[1]; Montagna, Gabriele ^[2]; Arletti, Rossella ^[3]; Vezzalini, Giovanna ^[2]

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1. Dipartimento di Scienze della Terra, Universita di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina S. Agata (Italy)
2. Dipartimento di Scienze della Terra, Universita di Modena e Reggio Emilia, Via S. Eufemia 19, 41100 Modena (Italy)
3. Dipartimento di Scienze Mineralogiche e Petrologiche, Via Valperga Caluso 35, 10125 Torino (Italy)

The elastic behavior of H-ZSM-5 was investigated by in-situ synchrotron X-ray powder diffraction, 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. From P{sub amb} to 6.2 GPa the volume reduction observed in s.o. is 16.6%. This testifies that H-ZSM-5 is one of the most flexible microporous materials up to now compressed in s.o. Volume reduction observed in m.e.w. up to 7.6 GPa is 14.6%. A strong increase in the total electron number of the extraframework system, due to the penetration of water/alcohol molecules in the pores, is observed in m.e.w. This effect is the largest up to now observed in zeolites undergoing this phenomenon without cell volume expansion. The higher compressibility in s.o. than in m.e.w. can be ascribed to the penetration of the extra-water/alcohol molecules, which stiffen the structure and contrast the channel deformations. - Graphical abstract: High-pressure behavior of H-ZSM-5 compressed in (16:3:1) methanol:ethanol:water: (a) projection of the structure along the [0 1 0] direction at P{sub amb}, 2 GPa and after pressure release to original ambient conditions (P{sub amb} (rev)), and (b) P-dependence of the extraframework content expressed as total number of electrons (gray square represents the number of the extraframework electrons at P{sub amb} after decompression). Highlights: > X-ray powder diffraction study of H-ZSM-5 compressibility. > H-ZSM-5 is one of the softest porous material compressed in silicon oil. > Penetration of additional water/alcohol molecules upon compression in m.e.w. > Extra molecules contribute to stiffen the structure and to contrast HP effects.

• OSTI ID: 21580120
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALCOHOLS
COHERENT SCATTERING
COMPRESSIBILITY
DIFFRACTION
ETHANOL
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MECHANICAL PROPERTIES
METHANOL
MINERALS
MOLECULES
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
POROUS MATERIALS
PRESSURE RANGE
PRESSURE RANGE MEGA PA
PRESSURE RANGE MEGA PA 10-100
PRESSURE RELEASE
SCATTERING
SILICATE MINERALS
SILICONES
SILOXANES
WATER
X-RAY DIFFRACTION
ZEOLITES