The Role of Cobalt in Unsupported MoS2 Hydrodesulfurization Catalysts

Autor:	E. Furimsky, C. H. Amberg
Rok vydání:	1975
Předmět:	Atmospheric pressure Organic Chemistry Inorganic chemistry chemistry.chemical_element General Chemistry Sulfur Catalysis chemistry.chemical_compound chemistry Phase (matter) Thiophene Organic chemistry Cobalt Hydrodesulfurization Stoichiometry
Zdroj:	Canadian Journal of Chemistry. 53:2542-2547
ISSN:	1480-3291 0008-4042
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae06e4c0bcaaef59f014904f74cc0442 https://doi.org/10.1139/v75-363 Zobrazit plný text záznamu