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@article{1071242,
author = {Stýskalík, Aleš and Škoda, David and Pinkas, Jiří and Mathur, Sanjay},
article_location = {Dordrecht},
article_number = {3},
doi = {http://dx.doi.org/10.1007/s10971-012-2808-5},
keywords = {Non-hydrolytic; amide elimination; titanosilicate; epoxidation; catalysis},
language = {eng},
issn = {0928-0707},
journal = {Journal of Sol-Gel Science and Technology},
title = {Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts},
url = {http://link.springer.com/article/10.1007%2Fs10971-012-2808-5},
volume = {63},
year = {2012}
}
TY - JOUR
ID - 1071242
AU - Stýskalík, Aleš - Škoda, David - Pinkas, Jiří - Mathur, Sanjay
PY - 2012
TI - Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts
JF - Journal of Sol-Gel Science and Technology
VL - 63
IS - 3
SP - 463-472
EP - 463-472
PB - Springer Science + Business Media
SN - 09280707
KW - Non-hydrolytic
KW - amide elimination
KW - titanosilicate
KW - epoxidation
KW - catalysis
UR - http://link.springer.com/article/10.1007%2Fs10971-012-2808-5
L2 - http://link.springer.com/article/10.1007%2Fs10971-012-2808-5
N2 - Novel non-hydrolytic syntheses of titanosilicate xerogels by polycondensation of silicon acetate, Si(OAc)4, with titanium (IV) dimethylamide or diethylamide, Ti(NR2)4 (R = Me, Et), are presented. The reactions are based on acetamide elimination and yield gels with a high content of Si-O-Ti bonds in comparison with the ester elimination route. Although a ligand exchange was observed, it was interestingly not followed by homo-condensation and during the synthesis the phase separation to SiO2 and TiO2 was avoided. The degree of condensation reached up to 68 %. The xerogels prepared for a comparison by ester elimination from Si(OAc)4 and titanium (IV) isopropoxide featured a significantly lower content of the Si-O-Ti bonds. The initial tests in the epoxidation of cyclohexene by cumyl hydroperoxide (CHP) indicated a high selectivity and moderate activity of the xerogels. The catalytic properties were significantly improved by combining non-hydrolytic and hydrolytic methods yielding mesoporous and homogeneous Si/Ti mixed oxides. The catalysts prepared by these methods provided a complete epoxidation of cyclohexene in 2 h at 65 oC.
ER -
STÝSKALÍK, Aleš, David ŠKODA, Jiří PINKAS a Sanjay MATHUR. Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts. \textit{Journal of Sol-Gel Science and Technology}. Dordrecht: Springer Science + Business Media, 2012, roč.~63, č.~3, s.~463-472. ISSN~0928-0707. Dostupné z: https://dx.doi.org/10.1007/s10971-012-2808-5.
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