A. Ramstetter, M. Baerns
Feb 1, 1988
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0
Influential Citations
45
Citations
Journal
Journal of Catalysis
Abstract
Abstract Adsorption states of 1-butene, 1,3-butadiene, furan, maleic anhydride, and 2,5 H -furanone on an alumina-supported V 2 O 5 P 2 O 5 catalyst were investigated by infrared spectroscopy. Measurements were carried out at temperatures between 373 and 423 K. Within this temperature range oxidation of the primarily formed adsorbates was mostly negligible. Maleic anhydride was also adsorbed up to 573 K. 1-Butene adsorbed at 373 K forms two different π complexes; the formation of carboxylates can be neglected. 1,3-Butadiene seems to be adsorbed in two different states on the catalyst at 423 K: both CC double bonds form (a) a π complex with the surface and (b) a 1,4 addition complex via σ bonds. Furan adsorbs by forming an addition complex via the 2-position of the ring; this complex undergoes reaction at 403 K. 2,5 H -Furanone forms another 2-furanone complex by abstraction of an allylic hydrogen, which then reacts to 4-oxo-2-butenoic acid under oxidative conditions. Maleic anhydride forms a maleate structure with the surface, but physisorbed maleic anhydride is also found even at elevated temperatures.