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Hexagonal mesoporous titanosilicates as support for vanadium oxide-Promising catalysts for the oxidative dehydrogenation of n-butane
Authors: Setnička Michal | Čičmanec Pavel | Bulánek Roman | Zukal Arnošt | Pastva Jakub
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Catalysis Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 132-139
Titles:
Language Name Abstract Keywords
cze Hexagonální mezoporézní titanosilikáty jako nosič pro oxidy vanadu-Nadějné katalyzátory pro oxidativní dehydrogenaci n-butanu Srovnávací studie strukturních vlastností a katalytického výkonu V-obsahujících mezoporézních silik s vysokým povrchem a mezoporézních titanosilikátů (HMS, Ti-HMS) v oxidativní dehydrogenaci n-butanu byla provedena. Cílem studie bylo prozkoumat efekt odlišného množství titanu inkorporovaného do nosiče na texturu, komplexy vanadu a jejich vliv na katalytický výkon. mezoporézní titanosilikát; hexagonální mezoporézní struktura; vanad; oxidativní dehydrogenaceů buteny
eng Hexagonal mesoporous titanosilicates as support for vanadium oxide-Promising catalysts for the oxidative dehydrogenation of n-butane The comparative study of structural properties and catalytic performance of V-containing high-surface mesoporous silica and mesoporous titanosilicate materials (HMS, Ti-HMS) in oxidative dehydrogenation of n-butane (C-4-ODH) was carried out. The aim of the study was to investigate effect of different titanium amount incorporated into silica support on the texture, speciation of vanadium complexes and its impact on catalytic performance. Prepared catalysts were characterized by XRF for determination of vanadium content, DTA/TG for thermal stability of matrix, XRD, SEM and N-2-adsorption for study of morphology and texture, FT-IR and DR UV-vis spectroscopy for verification of successful incorporation of Ti to the matrix and H-2-TPR and DR UV-vis spectroscopy for determination of vanadium complex speciation. All prepared materials were tested in n-butane ODH reaction at 460 degrees C. We conclude that titanium was successfully incorporated into mesoporous structure, which was preserved at least up to 600 degrees C. Catalytic activities of V-Ti-HMS catalysts were approximately four times higher than activity of V-HMS catalyst in spite of the fact that all samples exhibit the same amount of vanadium species with similar distribution. The selectivity to desired products was comparable for all catalysts. Enhanced catalytic activity of V-Ti-HMS materials allows activating of n-butane at significantly lower temperature (by 100 degrees C) compare with V-HMS materials. mesoporous titanosilicate; hexagonal mesoporous structure; vanadium; oxidative dehydrogenation; butenes

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