PINKAS, Jiří. Nonhydrolytic Sol-Gel Reactions for the Synthesis of Oxide Materials. In 36th International Conference on Advanced Ceramics and Composites. 2012.
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Basic information
Original name Nonhydrolytic Sol-Gel Reactions for the Synthesis of Oxide Materials
Name in Czech Nehydrolytické sol-gelové reakce pro syntézu oxidických materiálů
Authors PINKAS, Jiří (203 Czech Republic, guarantor, belonging to the institution).
Edition 36th International Conference on Advanced Ceramics and Composites, 2012.
Other information
Original language English
Type of outcome Requested lectures
Field of Study 10402 Inorganic and nuclear chemistry
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14740/12:00059292
Organization unit Central European Institute of Technology
Keywords (in Czech) sol-gel
Keywords in English sol-gel
Tags International impact
Changed by Changed by: prof. RNDr. Jiří Pinkas, Ph.D., učo 627. Changed: 15. 10. 2012 10:19.
Abstract
Nonhydrolytic sol-gel processes are promising new routes for the preparation of new oxide, silicate and phosphate materials. These reactions are based on aprotic polycondensations with the elimination of small organic molecules (ethers, esters, alkylhalides, etc.) in the absence of hydroxyl groups. One of our goals was the synthesis of new precursors - aluminum chloride-alkoxides - and their nonhydrolytic transformation to alumina by alkylhalide elimination. The second area of interest was improving the synthesis of phosphosilicate gels. We prepared phosphosilicate gels by the elimination of acetic acid esters in heteropolycondensation reactions between silicon(IV) acetate and tris(trimethylsilyl) ester of phosphoric acid. The nonhydrolytic ester elimination provides clear amorphous hybrid phosphonosilicate gels at room temperature. Finally, a novel non-hydrolytic syntheses of a SiO2-TiO2 mixed oxide system by the polycondensation of silicon(IV) acetate with titanium(IV) dimethylamide, diethylamide,and isopropoxide was studied. The materials were tested in the epoxidation of cyclohexene by cumyl hydroperoxide and showed a high selectivity but a mediocre activity. Catalytic properties were significantly improved by combining non-hydrolytic and hydrolytic methods yielding mesoporous and homogeneously mixed silica-titania dioxide.
Links
ED1.1.00/02.0068, research and development projectName: CEITEC - central european institute of technology
LH11028, research and development projectName: Nehydrolytické sol-gelové reakce pro přípravu křemičitanů a fosforečnanů s řízenou porozitou a funkčními skupinami na povrchu (Acronym: NHSGKNOX)
Investor: Ministry of Education, Youth and Sports of the CR, KONTAKT II
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icacc12-final-program_abstr_PINKAS_EUUSA-008-2012.pdf   File version Pinkas, J. 8. 2. 2012

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