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Catalytic activity of mesoporous vanado-titanosilicate with SBA 15 structure in oxidative dehydrogenation of propane

Authors: Švadlák Daniel | Balatka Leoš | Setnička Michal | Bulánek Roman | Čičmanec Pavel | Pastva Jakub | Zukal Arnošt

Year: 2013

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Catalytic activity of mesoporous vanado-titanosilicate with SBA 15 structure in oxidative dehydrogenation of propane	Vanadium oxides are powerful redox catalysts in many industrial processes and they are taken as catalysts in oxidation reaction as well as for dehydrogenation reaction of alkanes. However, they cannot be used in its bulk form, because it leads to non-selective reactions. They have to be used as the well dispersed VOx species anchored on the suitable support, which can influenced the activity and selectivity of catalysts. This is the reason why we combine large surface area, good thermal and hydrothermal stability of silica based materials with good catalytic activity of titanium support. We prepared mesoporous materials with SBA-15 with isomorphly substituted Ti atom which serve like an anchor for vanadium oxide species. Aim of this combination is to utilize benefits of both oxides and achieve a better activity and sufficient selectivity in oxidative dehydrogenation reaction of alkenes. In this contribution, successful synthesis of Ti-SBA-15 supports with Si/Ti ratio ranging from 1.5 to 20 is reported. VOx-Ti-SBA-15 catalysts with 3.6 wt. % were prepared from all supports by impregnation of water/ethanolic solution of vanadyl acetoacetonate. Catalytic activity of catalysts was tested in oxidative dehydrogenation of propane. Catalytic activities of individual catalysts expressed by productivity and turn-over-frequency significantly differ depending on content of titanium as well as selectivity toward propene. Complete experimental data comprising variation of reaction temperature, contact time and time-on-stream will be present and discuss in broader context.	Catalytic activity; mesoporous; vanado-titanosilicate; SBA-15; dehydrogenation of propane