MFI-type ferrisilicate catalysts for the oxidative dehydrogenation of alkanes
The catalytic properties of transition-metal ions in the framework of metallosilicate zeolites are different from those of pure transition-metal oxides. The authors have reported that framework Fe{sup 3+} in MFI-type ferrisilicate catalyzes the oxidative dehydrogenation of n-butane into butenes more selectively than the Fe{sup 3+} ions in iron oxide supported on silicalite or Fe-exchanged ZSM-5. The Fe{sup 3+} ions in the latter two catalysts mainly catalyze the total oxidation of n-butane into CO{sub 2}. Iron oxide on silicate dehydrogenates butane beyond butenes to 1,3-butadiene, while ferrisilicate exhibits a low activity for the further dehydrogenation of butenes produced. It is impossible to dehydrogenate small branched alkanes such as isobutane beyond isobutene to a conjugated diene, or lower alkanes such as propane beyond propylene. Therefore, the dehydrogenation activity and selectivity of these catalysts for the oxidative dehydrogenation of isobutane and propane may differ from those for the n-butane reaction. In this work, the authors report the catalytic properties of framework iron in MFI-type ferrisilicate for the oxidative dehydrogenation of isobutane and propane. A comparison of the activity and selectivity of ferrisilicate for these reactions with those of Fe-exchanged ZSM-5 and iron oxide supported on silicalite has been made. 6 refs., 1 tab.
- OSTI ID:
- 47987
- Journal Information:
- Journal of Catalysis, Vol. 150, Issue 2; Other Information: PBD: Dec 1994
- Country of Publication:
- United States
- Language:
- English
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