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Structure, activity and selectivity of V2O5-TiO2 catalysts for o-xylene conversion

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Abstract

The formation of needle shaped crystallites of V6O13 at low V concentrations on V2O5-anatase coated catalysts explains the low selectivity for phthalic anhydride during o-xylene oxidation. The (010) plane of V-oxide, most active for selective oxidation of o-xylene, is not accessible and the contact of this plane with the anatase faces promotes the anatase-rutile transformation and the incorporation and blocking of V4+ ions.

Abstract

Образование игольчатых кристаллитов V6O13 при низкой концентрации V на катализаторах, покрытых V2O5-анатазом, объясняет низкую селективность к образованию фталевого ангидрида при окислении о-ксилола. Плоскость (010) окиси ванадия, наиболее активная для селективного окисления о-ксилола, не доступна, и контакт этой плоскости с плоскостью анатаза усиляет превращение анатаз-рутил и встраивание и блокирование ионов V+4.

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Haase, R., Illgen, U., Scheve, J. et al. Structure, activity and selectivity of V2O5-TiO2 catalysts for o-xylene conversion. React Kinet Catal Lett 28, 395–400 (1985). https://doi.org/10.1007/BF02062971

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  • DOI: https://doi.org/10.1007/BF02062971

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