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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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