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Thermal reactions in mixtures of micron-sized silicon monoxide and titanium monoxide: redox paths overcoming passivation shells

SYSNO ASEP	0484216
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Thermal reactions in mixtures of micron-sized silicon monoxide and titanium monoxide: redox paths overcoming passivation shells
Author(s)	Jandová, V. (CZ) Pokorná, D. (CZ) Kupčík, Jaroslav (UACH-T)_{SAI, RID, ORCID} Bezdička, Petr (UACH-T)_{SAI, RID, ORCID} Křenek, T. (CZ) Netrvalová, M. (CZ) Cuřínová, P. (CZ) Pola, J. (CZ)
Source Title	Research on Chemical Intermediates. - : Springer - ISSN 0922-6168 Roč. 44, č. 1 (2018), s. 503-516
Number of pages	14 s.
Language	eng - English
Country	NL - Netherlands
Keywords	Silicon monoxide ; Titanium monoxide ; High-temperature ; Oxygen-transfer reactions ; Titanium suboxides ; Titanium silicide ; Methylene blue depletion
Subject RIV	CA - Inorganic Chemistry
OECD category	Inorganic and nuclear chemistry
Institutional support	UACH-T - RVO:61388980
UT WOS	000419609200030
EID SCOPUS	85028343913
DOI	10.1007/s11164-017-3116-z
Annotation	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.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2019

Number of the records: 1