Synthesis and crystal structure of dehydrated, deaminated, and dealuminated zeolite Y (FAU): Single-crystal structure of |Na33H26(Al5O4)|[Si126Al66O384]-FAU

Lim, Woo Taik, Seo, Sung Man, Lee, Oh Seuk, Wang, Lianzhou and Lu, Gao Qing (2010) Synthesis and crystal structure of dehydrated, deaminated, and dealuminated zeolite Y (FAU): Single-crystal structure of |Na33H26(Al5O4)|[Si126Al66O384]-FAU. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 67 3-4: 261-269. doi:10.1007/s10847-009-9706-7

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Author Lim, Woo Taik
Seo, Sung Man
Lee, Oh Seuk
Wang, Lianzhou
Lu, Gao Qing
Title Synthesis and crystal structure of dehydrated, deaminated, and dealuminated zeolite Y (FAU): Single-crystal structure of |Na33H26(Al5O4)|[Si126Al66O384]-FAU
Journal name Journal of Inclusion Phenomena and Macrocyclic Chemistry   Check publisher's open access policy
ISSN 1388-3127
1573-1111
Publication date 2010-08-01
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s10847-009-9706-7
Volume 67
Issue 3-4
Start page 261
End page 269
Total pages 9
Editor John D. Lamb
C. A. Schalley
Place of publication Dordrecht, Netherlands
Publisher Kluwer Academic
Collection year 2011
Language eng
Formatted abstract
A single crystal of zeolite Y, |Na71|[Si121Al71O384]-FAU, was ion exchanged to generate |(NH4)38Na33|[Si121Al71O384]-FAU. This was then vacuum dehydrated at 673  K, and, without re-exposure to the atmosphere, its structure was determined crystallographically using synchrotron X-radiation in the cubic space group Fd3m at 294  K. It was refined to the final error index R1 = 0.0532 with 522 reflections for which Fo > 4σ(Fo). The composition (best integers) is determined to be |Na33H26(Al5O4)|[Si126Al66O384]-FAU which means full dehydration, deamination, and dealumination were achieved. The 33 Na+ ions per unit cell were found at two crystallographically distinct positions: nine at site I (in the centers of the D6Rs) and 24 at site II (in supercages opposite S6Rs). The 2.5 sodalite units contained a dimeric tetrahedral aluminate cation (Al–O = 1.40(8) and 1.60(8) Å) at its center. Each [Al5O4]7+ cation coordinates to framework oxygen of D6Rs with tetrahedral manner. This work demonstrates that it is possible to obtain large amount of dealuminated species within the H-Y zeolite framework which should enhance the acidity of adjacent sites for higher catalytic activity.
© Springer Science+Business Media B.V. 2009
Keyword Zeolite Y
Structure
Dehydration
Deamination
Dealumination
X-ray
Indium
Coordination
Diffraction
Aluminum
Complex
NaX
HY
Aluminium
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 20 November 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Created: Sun, 13 Jun 2010, 10:03:21 EST