Redkina A. Synthesis and properties of micro/mesoporous systems based on oxides of silicon, titanium and vanadium

The dissertation is devoted to the research of the hydrothermal alkaline template synthesis of micro-, meso- and micro/mesoporous titanosilicates from pyrogenic titanoaerosil (ТАS) contained formed Ti-O-Si bonds and isolated co-ordinatively unsaturated ions of titanium. Also it is devoted to definition of influence of physical and chemical properties of the obtained structures on their catalytic activity and activity of supported vanadium oxide in processes dehydrogenation of propane to propylene at presence and absence of oxygen in a reactionary mix of propane - rare gas. It is shown that use ТАS allows to simplify synthesis nanoordered titanosilicates, to prepare biporous systems with a degree of crystallinity walles of mesopores that depended on duration of synthesis procedure and to keep an initial condition of the active sites of Ti ions. It is established, that received micro-and biporous titanosilicates show high selectivity in processes dehydrogenation of propane and give a high yield of propylene at supporting on them the vanadium oxide, that depended from the general acidity of a surface of the supported systems and the formed dimension of diameter of their pores аnd which corresponds to the certain range of correlation of these sizes. It is certain, that introduction of V ions in structure porous titanosilicates at their direct hydrothermal synthesis from ТАS is limited, but promotes hydrostability of systems.