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Effect of cobalt on the sulfiding temperature of CoOMoO3/Al2O3 studied by temperature programmed sulfiding by Ryuichiro Iwamoto; Kazuhiro Inamura; Takao Nozaki; Akira Iino is a Materials Science article available to read on EtoBox.

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The effect of cobalt on the sulfiding temperature of CoO-MoO3/A1203 was investigated by means of temperature programmed sulfiding (TPS). MoO3 supported on alumina transforms into MoSz .~ by sulfidation via formation and subsequent hydrogenation of Mo oxi-sulfide or MoS3. The temperature of which the Mo oxi-sulfide or MoS~ phase are hydrogenated (Ps temperature) decreased with increasing amount of cobalt in the CoO-MoO3/AI203 catalysts. A decrease in the Ps temperature was also observed in the case of 'Co/AI+Mo/AI catalysts' which were prepared by mechanical mixing of C00/A1203 and MoO3/A1203. On the other hand, the Ps temperature did not change by mechanical mixing of bulk CoO and the MoO3/A1203 catalyst. The cobalt adsorption test suggested that the cobalt species preferably interact with the molybdenum species during impregnation. It was concluded that the well dispersed cobalt species have a capability to provide spillover hydrogen to accelerate the hydrogenation of the Mo oxi-sulfide. Furthermore, a correlation between the Ps temperature and HDS activity for light gas oil was obtained. This result suggests that the cobalt species facilitate the hydrogenation of sulfur atoms ads

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Author

Ryuichiro Iwamoto; Kazuhiro Inamura; Takao Nozaki; Akira Iino

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-860X)

Published

1997

Language

EN

Field

Materials Science (Physical Sciences)