Surface reactivity of non-hydrolytic silicophosphate xerogels:
a simple method to create Bronsted or Lewis acid sites on
porous supports

J 2016

Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Bronsted or Lewis acid sites on porous supports

STÝSKALÍK, Aleš, David ŠKODA, Zdeněk MORAVEC, Craig E. BARNES, Jiří PINKAS et. al.

Základní údaje

Originální název

Surface reactivity of non-hydrolytic silicophosphate xerogels: a simple method to create Bronsted or Lewis acid sites on porous supports

Autoři

STÝSKALÍK, Aleš (203 Česká republika, domácí), David ŠKODA (203 Česká republika, domácí), Zdeněk MORAVEC (203 Česká republika, domácí), Craig E. BARNES (840 Spojené státy) a Jiří PINKAS (203 Česká republika, garant, domácí)

Vydání

New Journal of Chemistry, Cambridge, ROYAL SOC. CHEMISTRY, 2016, 1144-0546

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10402 Inorganic and nuclear chemistry

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.269

Kód RIV

RIV/00216224:14740/16:00089879

Organizační jednotka

Středoevropský technologický institut

DOI

http://dx.doi.org/10.1039/c5nj02928g

UT WoS

000373993600087

Klíčová slova anglicky

Non-hydrolytic; sol-gel; silicon acetate; silicophosphate; xerogel; heterogeneous; catalysis; Lewis acid; Bronsted acid

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 22. 2. 2017 12:57, Mgr. Eva Špillingová

Anotace

V originále

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.

Návaznosti

LQ1601, projekt VaV

Název: CEITEC 2020 (Akronym: CEITEC2020)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CEITEC 2020

Citovat

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. 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.

@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.

Podrobný výpis o publikaci