Infrared characterization of the surface intermediates in the oxidation of toluene on vanadyl pyrophosphate catalysts |
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Authors: | Bentrup Ursula Martin Andreas Lücke Bernhard |
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Affiliation: | 1.Institut für Angewandte Chemie Berlin-Adlershof e.V., Richard-Willst?tter-Strasse 12, D-12489 Berlin, Germany ; |
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Abstract: | The adsorption and reaction of toluene on vanadyl pyrophosphate catalysts was studied by in situ infrared spectroscopy. Strongly
adsorbed benzaldehyde and physically adsorbed cyclic anhydride species were observed at temperatures above 523 K. Water formed
during reaction generates acid hydroxyl groups which cause a stronger adsorption of benzaldehyde and consecutive oxidation
reactions. By co-adsorption of pyridine the acid sites are blocked and the deeper oxidation is suppressed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | vanadyl pyrophosphate toluene partial oxidation benzaldehyde acidity pyridine acetonitrile in situ FTIR spectroscopy |
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