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@article{1316862, author = {Stýskalík, Aleš and Škoda, David and Moravec, Zdeněk and Roupcová, Pavla and Barnes, Craig E. and Pinkas, Jiří}, article_location = {Cambridge}, article_number = {90}, doi = {http://dx.doi.org/10.1039/c5ra10982e}, keywords = {PHOSPHORIC-ACID CATALYST; ORGANIC-INORGANIC HYBRID; SOL-GEL SYNTHESIS; PHOSPHOSILICATE GELS; AMBIENT CONDITIONS; CRYSTAL-STRUCTURE; MOLECULAR-SIEVES; SURFACE-AREA; MAS NMR; GLASSES}, language = {eng}, issn = {2046-2069}, journal = {RSC Advances}, title = {Non-aqueous template-assisted synthesis of mesoporous nanocrystalline silicon orthophosphate}, volume = {5}, year = {2015} }
TY - JOUR ID - 1316862 AU - Stýskalík, Aleš - Škoda, David - Moravec, Zdeněk - Roupcová, Pavla - Barnes, Craig E. - Pinkas, Jiří PY - 2015 TI - Non-aqueous template-assisted synthesis of mesoporous nanocrystalline silicon orthophosphate JF - RSC Advances VL - 5 IS - 90 SP - 73670-73676 EP - 73670-73676 PB - Royal Society of Chemistry SN - 20462069 KW - PHOSPHORIC-ACID CATALYST KW - ORGANIC-INORGANIC HYBRID KW - SOL-GEL SYNTHESIS KW - PHOSPHOSILICATE GELS KW - AMBIENT CONDITIONS KW - CRYSTAL-STRUCTURE KW - MOLECULAR-SIEVES KW - SURFACE-AREA KW - MAS NMR KW - GLASSES N2 - The first synthesis of mesoporous nanocrystalline silicon orthophosphate Si5P6O25 is presented. The synthetic procedure is based on the non-hydrolytic sol-gel reaction in the presence of Pluronic P123 template and subsequent calcination in air. The condensation of silicon acetate, Si(OAc)(4), and tris(trimethylsilyl) phosphate, OP(OSiMe3)(3) (TTP), in non-aqueous solvents driven by elimination of trimethylsilyl acetate provides a homogeneous network with a high content of Si-O-P bonds and SiO6 moieties. After burning out the template, mesoporous silicon orthophosphate was obtained with surface areas up to 128 m(2) g(-1) and pore sizes around 20 nm. The nanocrystalline Si5P6O25 phase forms relatively easily (500 degrees C, 4 h) in comparison with other synthetic routes. All samples were characterized by SEM, TEM, elemental analysis, TGA, nitrogen adsorption, SAXS, H-1, C-13, Si-29, and P-31 solid-state NMR spectroscopy, and powder XRD. These xerogels showed superior catalytic activity and selectivity in methylstyrene dimerization. ER -
STÝSKALÍK, Aleš, David ŠKODA, Zdeněk MORAVEC, Pavla ROUPCOVÁ, Craig E. BARNES a Jiří PINKAS. Non-aqueous template-assisted synthesis of mesoporous nanocrystalline silicon orthophosphate. \textit{RSC Advances}. Cambridge: Royal Society of Chemistry, 2015, roč.~5, č.~90, s.~73670-73676. ISSN~2046-2069. Dostupné z: https://dx.doi.org/10.1039/c5ra10982e.
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