PHASE FORMATION IN ALKALINE TITANOSILICATE SYSTEMS DURING HYDROTHERMAL SYNTHESIS

L. G. Gerasimova; Герасимова Л. Г.; E. S. Shchukina; Щукина Е. С.; M. V. Maslova; Маслова М. В.; A. I. Nikolaev; Николаев А. И.

doi:10.31857/S2686953523700255

PHASE FORMATION IN ALKALINE TITANOSILICATE SYSTEMS DURING HYDROTHERMAL SYNTHESIS

Authors: Gerasimova L.G.¹, Shchukina E.S.¹, Maslova M.V.¹, Nikolaev A.I.¹
Affiliations:
1. Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”, Science Centre of Russian Academy of Sciences
Issue: Vol 513, No 1 (2023)
Pages: 86-92
Section: CHEMISTRY
URL: https://journals.rcsi.science/2686-9535/article/view/252498
DOI: https://doi.org/10.31857/S2686953523700255
EDN: https://elibrary.ru/BIUMSJ
ID: 252498

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Abstract

The investigations in the polycomponent high alkaline systems – TiO₂–H₂SO₄–Na₂SiO₃–NaOH–H₂O and TiO₂–H₂SO₄–(NH₄)₂SO₄–Na₂SiO₃–NaOH–H₂O under hydrothermal synthesis conditions have been carried out to provide new products with the given technical properties. It has been shown that by directed selection of structure-forming components, in particular titanium compounds, together with optimal parameters of hydrothermal treatment of the obtained precursor, it is possible to form compounds with the given phase and chemical composition, morphology and particle size. It was found that the rate of structural transformations during synthesis depends on the phase composition of titanosilicate precursors. During their hydrothermal treatment, alkaline and thermal hydrolysis with subsequent dehydration of hydrolyzed phases of titanium (IV) and silicon take place. The process is accompanied by localization of free bonds providing formation of Ti–O–Si–O-bridges and their subsequent transformation into structured new formations.

Keywords

hydrothermal synthesis, phase formation, crystalline compounds, mineral-like titanosilicates, morphological properties, sorption

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