Journal
TOPICS IN CATALYSIS
Volume 11, Issue 1-4, Pages 139-145Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1027234116582
Keywords
vanadyl pyrophosphate; toluene; partial oxidation; benzaldehyde; acidity; pyridine; acetonitrile; in situ FTIR spectroscopy
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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.
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