The Role of Cobalt in Unsupported MoS2 Hydrodesulfurization Catalysts
- 1 September 1975
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 53 (17) , 2542-2547
- https://doi.org/10.1139/v75-363
Abstract
Crystalline MoS2 catalysts were impregnated with cobalt over the total composition range, and their catalytic activity in the hydrodesulfurization of thiophene tested in a microreactor at 400° and near atmospheric pressure. Three principal composition regions could be distinguished in the sulfided catalysts: (1) Co/(Co + Mo) compositions 0–0.4. In this region intercalated Co enhances the intrinsic activity which reaches a maximum near a Co content of 0.25. The region is sulfur "deficient" with respect to MoS2 + Co9S8 and there is no evidence for the presence of Co9S8. (2) Compositions 0.4–0.65. This region is characterized by the exact stoichiometry MoS2 + Co9S8 and by the appearance of a Co9S8 phase. Surface area experiences a fivefold increase, as does percent conversion, but intrinsic activity changes very little. (3) Compositions > 0.65. A region of lesser interest, it is sulfur "deficient", possibly through the formation of Co4S3, and surface area decreases steeply with Co content.Keywords
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