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Schlagwörter:
Ethane oxidation; Supported vanadium catalysts; Reaction kinetics
Zusammenfassung:
Two series of γ-alumina supported VOx catalysts with V loadings between 1 and 15 wt.-% prepared by different techniques were studied due their performance in selective oxidation of ethane. Additionally, experiments on the oxidation of ethylene and CO were performed in order to clarify the contributions of consecutive reactions. The results obtained demonstrate, that at low V loadings, corresponding to a high V dispersion, a higher ethylene selectivity is obtained than at higher loaded catalysts. This is especially due to a higher activity of V2O5 for consecutive ethylene oxidation to CO. Additionally, the redox cycles of vanadate and V2O5 are different: the first is mainly only between V(IV) and V(III), in contrast to the latter one, which is between V(V) and V(III)
