X-ray photoelectron spectroscopy study on the surface structure of NiMo catalysts for hydrodesulfurization of 4,6-dimethyl-ibenzothiophene
- Kyushu Univ., Fukuoka (Japan); and others
Deep desulfurization of diesel fuel has attracted current interest in the petroleum refining technology. Sufficient desulfurization of 4-methyldibenzotbiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT) are key for such a deep desulfurization where the steric hinderance of the substrate and by-product H{sub 2}S gas from other easy desulfurized sulfur compounds, such as benzothiophene and dibenzothiophene (DBT) retardation is major obstacle to achieve the sufficient desulfurization. H{sub 2}S has been reported to inhibit only direct removal of sulfur in DBT, where no inhibition was found at its hydrogenation stage. However the authors found that the catalytic activity of NiMo catalyst was markedly reduced by H{sub 2}S not only in the desulfurization of 4,6-DMDBT but also hydrogenation of naphthalene, suggesting that both active sites on NiMo catalyst were deactivated by H{sub 2}S. In the present study, a series of NiMo/Al{sub 2}O{sub 2} catalysts were examined in the desulfurization of 4,6-DMDBT in H{sub 2} or H{sub 2}/H{sub 2}S, varying contents of Ni. The surface species of Ni and Mo were also studied by XPS to find the origin of the catalytic activity or deactivity which are influenced by the atmospheres.
- OSTI ID:
- 215004
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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