The effects of coke deposition on NiMoO{sub 4} used in the oxidative dehydrogenation of butane
- Universidade Tecnica de Lisboa (Portugal)
The effects of coke deposition on the NiMoO{sub 4} catalyst used for oxidative dehydrogenation of n-butane have been investigated. The coke deposition rate and the catalyst changes during this process were studied by TG, FTIR, and XRD. Coke deposition induces segregation of the NiMoO{sub 4} into MoO{sub 3} and NiO. It was observed that the coke elimination in He/air flow for 30 min is not complete and the catalyst recovers only partially its structure. On the other hand, it was observed that coke deposition pretreatments lead to stabilization of the NiMoO{sub 4} {beta}-phase at room temperature. If the coke is totally eliminated, the {beta}-phase is again unstable. The expected catalyst deactivation with coke deposition was not observed. To the contrary, the conversion increases about 40% after such treatments, and the selectivity to dehydrogenation products also increases. Especially, the butadiene selectivity is more than twice higher. The increase of conversion and selectivity is ascribed to coke catalytic activity and {beta}-phase stabilization. 23 refs., 12 figs., 2 tabs.
- OSTI ID:
- 468691
- Journal Information:
- Journal of Catalysis, Vol. 164, Issue 2; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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