Infrared characterization of the surface intermediates in the oxidation oftoluene on vanadyl pyrophosphate catalysts

Authors
Bentrup, U Martin, A Lucke, B
Citation
U. Bentrup et al., Infrared characterization of the surface intermediates in the oxidation oftoluene on vanadyl pyrophosphate catalysts, TOP CATAL, 11(1-4), 2000, pp. 139-145
Citations number
14
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
TOPICS IN CATALYSIS
ISSN journal
10225528 → ACNP
Volume
11
Issue
1-4
Year of publication
2000
Pages
139 - 145
Database
ISI
SICI code
1022-5528(2000)11:1-4<139:ICOTSI>2.0.ZU;2-7
Abstract
The adsorption and reaction of toluene on vanadyl pyrophosphate catalysts w as studied by in situ infrared spectroscopy. Strongly adsorbed benzaldehyde and physically adsorbed cyclic anhydride species were observed at temperat ures above 523 K. Water formed during reaction generates acid hydroxyl grou ps which cause a stronger adsorption of benzaldehyde and consecutive oxidat ion reactions. By co-adsorption of pyridine the acid sites are blocked and the deeper oxidation is suppressed.