Počet záznamů: 1  

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

  1. 1. 0484216 - UACH-T 2019 RIV NL eng J - Článek v odborném periodiku
    Jandová, V. - Pokorná, D. - Kupčík, Jaroslav - Bezdička, Petr - Křenek, T. - Netrvalová, M. - Cuřínová, P. - Pola, J.
    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
    Institucionální podpora: RVO:61388980
    Klíčová slova: Silicon monoxide * Titanium monoxide * High-temperature * Oxygen-transfer reactions * Titanium suboxides * Titanium silicide * Methylene blue depletion
    Kód oboru RIV: CA - Anorganická chemie
    Obor OECD: Inorganic and nuclear chemistry
    Impakt faktor: 1.674, rok: 2017

    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.
    Trvalý link: http://hdl.handle.net/11104/0282019