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@article{1344772,
author = {Stýskalík, Aleš and Škoda, David and Moravec, Zdeněk and Barnes, Craig E. and Pinkas, Jiří},
article_location = {Cambridge},
article_number = {4},
doi = {http://dx.doi.org/10.1039/c5nj02928g},
keywords = {Non-hydrolytic; sol-gel; silicon acetate; silicophosphate; xerogel; heterogeneous; catalysis; Lewis acid; Bronsted acid},
language = {eng},
issn = {1144-0546},
journal = {New Journal of Chemistry},
title = {Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Bronsted or Lewis acid sites on porous supports},
url = {http://pubs.rsc.org/en/Content/ArticleLanding/2016/NJ/C5NJ02928G#!divAbstract},
volume = {40},
year = {2016}
}
TY - JOUR
ID - 1344772
AU - Stýskalík, Aleš - Škoda, David - Moravec, Zdeněk - Barnes, Craig E. - Pinkas, Jiří
PY - 2016
TI - Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Bronsted or Lewis acid sites on porous supports
JF - New Journal of Chemistry
VL - 40
IS - 4
SP - 3705-3715
EP - 3705-3715
PB - ROYAL SOC. CHEMISTRY
SN - 11440546
KW - Non-hydrolytic
KW - sol-gel
KW - silicon acetate
KW - silicophosphate
KW - xerogel
KW - heterogeneous
KW - catalysis
KW - Lewis acid
KW - Bronsted acid
UR - http://pubs.rsc.org/en/Content/ArticleLanding/2016/NJ/C5NJ02928G#!divAbstract
L2 - http://pubs.rsc.org/en/Content/ArticleLanding/2016/NJ/C5NJ02928G#!divAbstract
N2 - Non-hydrolytic sol-gel reactions of silicon acetates with trimethylsilyl (TMS) esters of phosphoric and phosphonic acids produce cross-linked matrices containing homogeneous dispersions of silicate and phosphoryl groups connected together by networks of Si-O-P(QO) linkages. The condensation degrees reach 80 to 90%. Residual organic groups (10 to 20%) were reacted with a variety of compounds (H2O, Me3SiOSiMe3, POCl3, SiCl4, AlMe3, Al(NMe2)(3), and AlCl3) in order to enrich the surface of these porous matrices with Bronsted (RP-OH) and Lewis (tetracoordinated Al) acid functional groups. The differences in the reactivity of RSi-OAc and RP-OSiMe3 groups were utilized for the selective modification at the silicon and phosphorus atoms. The reaction procedures were optimized and significantly porous silicophosphate materials with a high content of either hydroxyl groups or four-coordinated aluminium species were obtained. The activity and selectivity of prepared samples as catalysts for the dimerization of a-methylstyrene were tested. Excellent activities and moderate to very high selectivities were achieved suggesting the potential use of silicophosphate xerogels in heterogeneous catalysis.
ER -
STÝSKALÍK, Aleš, David ŠKODA, Zdeněk MORAVEC, Craig E. BARNES a Jiří PINKAS. Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Bronsted or Lewis acid sites on porous supports. \textit{New Journal of Chemistry}. Cambridge: ROYAL SOC. CHEMISTRY, 2016, roč.~40, č.~4, s.~3705-3715. ISSN~1144-0546. Dostupné z: https://dx.doi.org/10.1039/c5nj02928g.
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