Mesoporous SnO2-SiO2 and Sn-silica-carbon nanocomposites by novel non-hydrolytic templated sol-gel synthesis
| Autoři | |
|---|---|
| Rok publikování | 2016 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | RSC Advances |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C6RA16556G#!divAbstract |
| Doi | http://dx.doi.org/10.1039/c6ra16556g |
| Obor | Anorganická chemie |
| Klíčová slova | Tin Silicate; Mesoporous; Non-hydrolytic; Templated; Catalysis; Nanocomposite; Copolymer; Carbon |
| Popis | A novel non-hydrolytic sol-gel (NHSG) synthesis of mesoporous tin silicate xerogels is presented. The polycondensation between silicon tetraacetate, Si(OAc)(4), and tetrakis(diethylamido)tin, Sn(NEt2)(4), resulting in acetamide elimination leads to tin silicate xerogels containing Si-O-Sn linkages. The addition of Pluronic P123 or F127 templates provides homogeneous stiff gels that are, after template removal by calcination at 500 degrees C in air, converted to stable mesoporous silica xerogels with large surface areas (476 m(2) g(-1)) and dispersed SnO2 nanoparticles (6-7 nm). Heat treatment of the as-prepared tin silicate gels in an inert N-2 atmosphere leads to reduction and transformation to Sn nanoparticles (70-150 nm) embedded in a silica-carbon matrix. The composition and morphology of the xerogels, volatile reaction byproducts, and thermal transformations were followed by elemental analyses, IR spectroscopy, thermal analysis TG-DSC, nitrogen adsorption measurements, solid-state NMR spectroscopy, DRUV-vis spectroscopy, electron microscopy, and HT powder XRD. The SnO2-SiO2 xerogels were tested as potential catalysts for aminolysis of styrene oxide with aniline and for the Meerwein-Ponndorf-Verley reduction of 4-tert-butylcyclohexanone. The resulting reaction systems displayed good activity and selectivity. |
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