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Title
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Ordered end-member of ZSM-48 zeolite family
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Author
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Abstract
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| ZSM-48 and related zeolites are considered to be highly disordered structures. Different polytypes can be clearly distinguished by simulation of high-resolution electron microscopy images. Synthesis of phase-pure polytypes was attempted. One of the investigated samples crystallized via seeding designated as COK-8 consisted of nanoscopic, needlelike crystals with a very large length/width ratio, growing along the pore direction. These specimens are phase-pure polytype 6 (PT6, numbering according to Lobo and van Koningsveld). Aggregates of these nanoneedles occasionally contained a second polytype: PT1. The latter polytype occurred more abundantly in larger crystal rods in an IZM-1 sample crystallized in ethylene glycol. Here too, the isolated crystallites mainly consist of large, defect-free regions of PT6. A simulation of polytype lattice energies offers a rational explanation for the observed polytypical intergrowth formation. |
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Language
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English
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Source (journal)
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Chemistry of materials / American Chemical Society. - Washington, D.C., 1989, currens
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Publication
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Washington, D.C.
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2009
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ISSN
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0897-4756
[print]
1520-5002
[online]
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DOI
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10.1021/CM802614X
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Volume/pages
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21
:2
(2009)
, p. 371-380
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ISI
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000262605200026
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Full text (Publisher's DOI)
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