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  • Wiley-Blackwell  (1)
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    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Catalytically Active Surface Compounds. VII. Catalytic Properties of Oxidic Vanadium-Chromium CatalystsThe catalytic properties of silica supported vanadium-chromium catalysts for the oxidation of ethanol, butane, propene, and butene are described and completed by ESR measurements.Differences in catalytic activity of chromium-free vanadium catalysts which are caused by different values of the silanol group concentration of the support are shown to become levelled by the addition of chromium. V—O—Cr species of medium catalytic activity are considered to be the catalytic active center. ESR spectra taken after the reaction show the existence of Cr3+ and VO+2 species. A correlation between the intensity of the VO2+ signal and the catalytic activity of the samples is observed.
    Notes: Die katalytischen Eigenschaften von Vanadiumoxid-Chromoxid-Aufschichtkatalysatoren wurden bei der Oxydation von äthanol, Butan, Buten und Propen untersucht und ergänzende ESR-spektroskopische Messungen durchgeführt.Die großen, durch unterschiedliche Silanolgruppenkonzentration des Trägers bedingten Aktivitätsunterschiede der chromfreien Vanadiumoxid-Aufschichtkatalysatoren werden mit wachsendem Chromoxidgehalt nivelliert. Als katalytisch aktives Zentrum werden V—O—Cr-Gruppierungen mit mittlerer Aktivität diskutiert. ESR-Spektren zeigen die Existenz von Cr3+- und V4+-Ionen nach der katalytischen Reaktion, und es wird ein Zusammenhang zwischen der Intensität des VO2+-Signals und der katalytischen Aktivität der Katalysatoren beobachtet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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