Sulfided Co-Mo/. gamma. -alumina catalyst: evidence of structural changes during hydrodesulfurization of dibenzothiophene

Journal Article · Tue Aug 01 04:00:00 EDT 1978 · J. Catal.; (United States)

OSTI ID:5272923

Broderick, D H; Schuit, G C.A.; Gates, B C

Conversion of 0.12% dibenzothiophene in n-hexadecane at 300/sup 0/C and 104 atm on sulfided American Cyanamid HDS 16A catalyst (4.4%Co, 7.5% Mo) increased by 10% in the first 10-20 hr and decreased after a step change in the feed rate from 128 to 730 cc/hr g catalyst and continued to decrease for 50 hr. Further tests suggested that the increased space velocity reduced the product H/sub 2/S concentration which resulted in a decreased number of catalytic sites, and that the steady-state activity depended on the reactor startup procedure and probably also on the presulfiding procedure. Assuming that the catalyst consists of MoS/sub 2/ and Co/sub 9/S/sub 8/ on the alumina surface and that the active sites are molybdenum(III) ions located next to cobalt(II) ions intercalated at the edges of MoS/sub 2/ crystallites, the sulfur-deficient structures may contain CoMo/sub 2/S/sub 4/.

• Research Organization: Univ. Del.
• OSTI ID: 5272923
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 54:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT SULFIDES
DESULFURIZATION
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
HYDROGENATION
MOLECULAR STRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS