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Thermal Reactions in Mixtures of Micron-sized Silicon Monoxide and Titanium Monoxide - Redox Paths Overcoming Passivation Shells.
- 1.0484178 - ÚCHP 2019 RIV NL eng J - Journal Article
Jandová, Věra - Pokorná, Dana - Kupčík, Jaroslav - Bezdička, P. - Křenek, T. - Netrvalová, M. - Cuřínová, Petra - Pola, Josef
Thermal Reactions in Mixtures of Micron-sized Silicon Monoxide and Titanium Monoxide - Redox Paths Overcoming Passivation Shells.
Research on Chemical Intermediates. Roč. 44, č. 1 (2018), s. 503-516. ISSN 0922-6168. E-ISSN 1568-5675
R&D Projects: GA TA ČR TA04010169
Institutional support: RVO:67985858
Keywords : silicon monoxide * titanium monoxide * hifh-temperature
OECD category: Physical chemistry
Impact factor: 2.064, year: 2018
Silica–titania mixed oxides and composites have been extensively studied, whereas the titanium monoxide (TiO)–silicon monoxide (SiO) counterparts still remain to be explored. Here, we report on structural changes in heated SiO–TiO mixtures. The changes in composition in intimately mixed μm-sized particles of TiO and SiO heated at 1000 °C were examined by FTIR, UV–Vis and Raman spectroscopy, X-ray diffraction and electron (SEM and TEM) microscopy. They are shown to involve depletion of crystalline TiO and formation of titanium suboxides (Ti2.5O3, Ti2O3), rutile, elemental silicon, titanium silicide Ti5Si3 and amorphous binary SiOx, TiOx and ternary SixTiyOz nano-structures. These constituents of the developed Si/Ti/O composite are explained by SiO disproportionation, reduction of TiO by silicon, oxygen transfer (redox) reactions between TiOx and SiOx species and the combination of Ti and Si to obtain titanium silicide. The produced Si/Ti/O composite absorbs visible light and its solar-light photocatalytic activity in decolorization of methylene bBlue is compared to that of the unheated SiO, TiO and Ti5Si3 powders.
Permanent Link: http://hdl.handle.net/11104/0279321
Number of the records: 1