On the physisorption isotherm of the MFI-type zeolites: The high-pressure hysteresis

Characterization of model (Al)MFI-type samples, carried out initially by scanning electron microscopy and 27Al nuclear magnetic resonance spectroscopy, aided the elucidation of the mechanisms involved in producing the high-pressure H4-type hysteresis observed in argon, oxygen, nitrogen, and carbon m...

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Bibliographic Details
Published in:Microporous materials 1993-07, Vol.1 (4), p.247-256
Main Authors: Llewellyn, P.L., Grillet, Y., Patarin, J., Faust, A.C.
Format: Article
Language:English
Subjects:
27Al NMR spectroscopy
adsorption
hysteresis
MFI-type zeolites
volumetry
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Summary:Characterization of model (Al)MFI-type samples, carried out initially by scanning electron microscopy and 27Al nuclear magnetic resonance spectroscopy, aided the elucidation of the mechanisms involved in producing the high-pressure H4-type hysteresis observed in argon, oxygen, nitrogen, and carbon monoxide isotherms. This hysteresis seems to be the resultant of two different adsorbate related phenomena: swelling of microporous defect regions, accessible via larger fissures (created during calcination), occurs in conjunction with swelling between parallel crystal “slabs”. In both cases the adsorbate needs to be above its triple point (i.e., a three-dimensional liquid).
ISSN:0927-6513
1873-3107
DOI:10.1016/0927-6513(93)80068-6