Properties of Ti-Beta Zeolites
J. Phys. Chem. B, Vol. 102, No. 37, 1998 7131
4
. Conclusions
(10) Camblor, M. A.; Costantini, M.; Corma, A.; Gilbert, L.; Esteve,
P.; Martinez, A.; Valencia, S. J. Chem. Soc., Chem. Commun. 1996, 1339.
(11) Camblor, M. A.; Corma, A.; Valencia, S. Chem. Commun. 1996,
From the present study, the following conclusions can be
2
365.
(12) Rigutto, M. S.; De Ruiter, R.; Niederer, J. P. M.; Van Bekkum, H.
Stud. Surf. Sci. Catal. 1994, 84, 2245.
drawn: (1) The large-pore beta zeolite containing Ti can be
synthesized in the presence of alkali cations (Na ) by the dry-
gel conversion (DGC) technique using TEAOH as the structure-
directing agent. The presence of Na less than 1.0 mol % does
not affect the incorporation of titanium into the framework of
beta zeolites.
+
(13) Reddy, J. S.; Sayari, A. J. Chem. Soc., Chem. Commun. 1995, 23.
(14) Saxton, R. J.; Crocco, G. L.; Zajacek, J. G.; Wijesekea, K. S. Eur.
Patent 1994, 659 685 A1.
15) van del Waal, J. C.; Lin, P.; Rigutto, M. S.; van Bekkum, H. Stud.
Surf. Sci. Catal. 1997, 105, 1093.
16) van del Waal, J. C.; Tan, K.; van Bekkum, H. Catal. Lett. 1996,
1, 63.
(17) van del Waal, J. C.; Kunkeler, P. J.; Tan, K.; van Bekkum, H. J.
Catal. 1998, 173, 74.
18) van del Waal, J. C.; van Bekkum, H. J. Mol. Catal. 1997, 124,
37.
19) Xu, W.; Dong, J.; Li, J.; Wu, F. J. Chem. Soc., Chem. Commun.
1990, 755.
(20) Kim, M. H.; Li, H. X.; Davis, M. E. Microporous Mater. 1993, 1,
91.
21) Matsukata, M.; Nishiyama, N.; Ueyama, K. Microporous Mater.
993, 1, 219.
22) Hari Prasad Rao, P. R.; Matsukata, M. J. Chem. Soc., Chem.
(
(2) Ti-beta-DGC adsorbs less amount of water than Ti-beta-
(
HTS, indicating the higher hydrophobicity of the former zeolite.
The intensity of the broad infrared band ranging from 3610 to
3
resulting from the defects in the zeolite structure, is lower for
Ti-beta-DGC than for Ti-beta-HTS.
4
-
1
300 cm , associated with hydrogen-bonded hydroxyl groups
(
1
(
(3) In the oxidation of hydrophobic substrate, such as
cyclohexane, the Ti-beta-DGC samples show higher activity than
Ti-beta-HTS, whereas they show similar activity in the oxidation
of alcohols. This is interpreted in tems of high hydrophobicity
of Ti-beta-DGC compared to that of Ti-beta-HTS.
1
(
1
(
Commun. 1996, 1441.
References and Notes
(23) Hari Prasad Rao, P. R.; Ueyama, M.; Matsukata, M. Appl. Catal.
998, 166, 97.
1
(
(
(
(
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(
Chem. Soc., Chem. Commun. 1992, 589.
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52, 18.
(
(
(
(
1
(7) Camblor, M. A.; Corma, A.; Perez-Pariente, J. Zeolites 1993, 13,
(
8
2.
Sci. Catal. 1991, 63, 421.
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(