Abstract
The influence of the alkali metals Na, K, Rb, and Cs on the catalytic properties of the system V2O5−TiO2 has been studied in the oxidation of o-xylene. When introducing the promoter into the catalyst, and as the alkaline nature of the metals increases, the initial selectivity to partial oxidation products increases. A correlation is observed between the selectivity and the acidity of the surface, which was determined in a model raction of cumene cracking. The most acidic sites of the surface are assumed to be responsible for the destructive oxidation of o-xylene. The rate of oxidation of phthalic anhydride remaines constant when the nature of the additive varied.
Abstract
Изучено влияние добавок щелочных металлов Na, K, Rb и Cs на каталитические свойства системы V2O5−TiO2 в реакции окисления о-ксилола. При введении в катализатор промотора и с ростом щелочности металла начальная селективность по продуктам парциального окисления увеличивается. Наблюдается корреляция между селективностъю и кислотностью поверхности, определенной по модельной реакции крекинга кумола. Предположено, что за деструктивное окисление о-ксилола ответственны наиболее кислые места поверхности. Скорость окисления фталевого ангидрида при вариации природы добавки оставалась постоянной.
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Boreskov, G.K., Ivanov, A.A., Ilyinich, O.M. et al. Influence of alkaline promoters on the selectivity of vanadium catalysts in the oxidation of o-xylene to phthalic anhydride. React Kinet Catal Lett 3, 1–8 (1975). https://doi.org/10.1007/BF02216882
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DOI: https://doi.org/10.1007/BF02216882