Non-Hydrolytic Synthesis of Titanosilicate Xerogels by
Acetamide Elimination and their Use as Epoxidation Catalysts

J 2012

Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts

STÝSKALÍK, Aleš; David ŠKODA; Jiří PINKAS a Sanjay MATHUR

Základní údaje

Originální název

Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts

Autoři

STÝSKALÍK, Aleš; David ŠKODA; Jiří PINKAS a Sanjay MATHUR

Vydání

Journal of Sol-Gel Science and Technology, Dordrecht, Springer Science + Business Media, 2012, 0928-0707

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10402 Inorganic and nuclear chemistry

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.660

Kód RIV

RIV/00216224:14740/12:00057761

Organizační jednotka

Středoevropský technologický institut

DOI

https://doi.org/10.1007/s10971-012-2808-5

UT WoS

000310162700020

Klíčová slova anglicky

Non-hydrolytic; amide elimination; titanosilicate; epoxidation; catalysis

Štítky

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 28. 1. 2014 21:59, prof. RNDr. Jiří Pinkas, Ph.D.

Anotace

V originále

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.

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

Přiložené soubory

SiOTi_nonhydrolSG_JSGST_2012_463-472.pdf

Požádat o autorskou verzi souboru

Citovat

STÝSKALÍK, Aleš; David ŠKODA; Jiří PINKAS a Sanjay MATHUR. Non-Hydrolytic Synthesis of Titanosilicate Xerogels by Acetamide Elimination and their Use as Epoxidation Catalysts. 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://doi.org/10.1007/s10971-012-2808-5.

@article{1071242,
   author = {Stýskalík, Aleš and Škoda, David and Pinkas, Jiří and Mathur, Sanjay},
   article_location = {Dordrecht},
   article_number = {3},
   doi = {https://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://doi.org/10.1007/s10971-012-2808-5.

Přehled o publikaci