ACS Catalysis
Letter
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specific T sites in this material may promote the formation of a
more defined transition state than the classical size-restriction
mechanism43 based on simple confinement. This suggests that
a defined transition state, possibly involving interaction
between a metal−complex catalyst and an organic substrate,
could operate in zeolite micropores. This finding could lead to
a new generation of catalyst design based on microporous
titanosilicates.
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ASSOCIATED CONTENT
* Supporting Information
■
S
Further details concerning the experimental procedures as well
as the results of catalyst reuse, a drawing of T-sites, illustrations
of equipment for steaming and Ti-insertion, 29Si MAS NMR of
various titanosilicates, N2 adsorption isotherms, a TEM image,
water adsorption isotherms, and a graphic of the possible
interactions between a phenol molecule and an active-state
framework of Ti-YNU-2 are included in Supporting Informa-
tion. This material is available free of charge via the Internet at
(24) Calabro, D. C.; Cheng, J. C.; Crane Jr, R. A.; Kresge, C. T.;
Dhingra, S. S.; Steckel, M. A.; Stern, D. L.; Weston, S. C. U.S. Patent
No. 6,049,018, 2000.
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2006, 110, 2045−2050.
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Chen, C.-Y.; Musilova-
2009, 266, 79−91.
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2010, 129, 256−266.
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N.; Bejblova,
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Pavlackova, M.; Kosova, G.; Cejka, J. J. Catal.
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M.; Gil, B.; Zones, S. I.; Burton, A. W.;
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AUTHOR INFORMATION
Corresponding Author
■
(28) Shibata, T.; Suzuki, S.; Kawagoe, H.; Komura, K.; Kubota, Y.;
Sugi, Y.; Kim, J.-H.; Seo, G. Microporous Mesoporous Mater. 2008, 116,
216−226.
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Sugi, Y. J. Mol. Catal. A: Chem. 2009, 297, 80−85.
(30) Ernst, S.; Elangovan, S. P.; Gerstner, M.; Hartmann, M.;
Sauerbeck, S. Abstr 14th Int. Zeol. Conf. 2004, 982.
(31) Inagaki, S.; Takechi, K.; Kubota, Y. Chem. Commun. 2010, 46,
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Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
■
This study was financially supported in part by Grant-in-Aid for
Scientific Research (nos. 13199071 and 23760741). We
acknowledge Dr. K. Yoshida and Dr. Y. Sasaki of Japan Fine
Ceramics Center (JFCC) for TEM observation. The authors
also thank Professor T. Tatsumi of Tokyo Institute of
Technology and Mr. Yuji Nishita of Yokohama National
University for helpful discussion and technical assistance,
respectively.
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