期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 20, 期 22, 页码 6672-6677出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201402055
关键词
catalysis; cluster ions; density functional theory; hydrocarbon activation; mass spectrometry
资金
- Fonds der Chemischen Industrie
- Deutsche Forschungsgemeinschaft (DFG)
- Cluster of Excellence Unifying Concepts in Catalysis - (DFG)
- Alexander von Humboldt-Stiftung
The gas-phase reactivity of [V2O5](+) and [Nb2O5](+) towards ethane has been investigated by means of mass spectrometry and density functional theory (DFT) calculations. The two metal oxides give rise to the formation of quite different reaction products; for example, the direct room-temperature conversions C2H6C2H5OH or C2H6CH3CHO are brought about solely by [V2O5](+). In distinct contrast, for the couple [Nb2O5](+)/C2H6, one observes only single and double hydrogen-atom abstraction from the hydrocarbon. DFT calculations reveal that different modes of attack in the initial phase of CH bond activation together with quite different bond-dissociation energies of the MO bonds cause the rather varying reactivities of [V2O5](+) and [Nb2O5](+) towards ethane. The gas-phase generation of acetaldehyde from ethane by bare [V2O5](+) may provide mechanistic insight in the related vanadium-catalyzed large-scale process.
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