Preparation and catalytic properties of highly dispersed molybdenum and cobalt-molybdenum sulfide catalysts supported on alumina
Journal Article
·
· Industrial and Engineering Chemistry Research
- Osaka Univ., Toyonaka, Osaka (Japan). Dept. of Chemical Engineering
Hydrotreatings of petroleum feedstocks have become more and more crucial not only for protecting environments but also for efficient utilization of natural resources. Highly dispersed molybdenum sulfides supported on alumina were found to be prepared by using Mo(CO){sub 6} as a starting material. The structure and catalytic activities for thiophene hydrodesulfurization (HDS) and butadiene hydrogenation (HYD) of the molybdenum sulfides and the effects of modification with Co by using Co{sub 2}(CO){sub 8} or Co(NO)(CO){sub 3} as a precursor were examined as a function of the dispersion of the molybdenum sulfide species. The structure and dispersion of molybdenum sulfides were studied by EXAFS techniques. The TOF (activity per Mo atom) of HDS remained invariant at a high dispersion of Mo, whereas the TOF of HYD increased with increasing dispersion of the molybdenum sulfide species. Dinuclear molybdenum sulfide species showed a significantly high TOF for the HYD. It was found with Mo/Al{sub 2}O{sub 3} catalysts promoted with Co that both the promotional ratio in the HDS activity and the amount of Co required for the maximum activity increased as the dispersion of the molybdenum sulfide increased.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 183108
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 11 Vol. 34; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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