Studies of molybdena-alumina catalysts. V. Relation between catalyst sulfided state and activity for thiophene hydrodesulfurization

Journal Article · Wed Jun 15 04:00:00 EDT 1977 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(77)90179-8· OSTI ID:5360820

Massoth, F E ^[1]; Kirby, C L

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1. Univ. of Utah, Salt Lake City

Sulfiding of a molybdena--alumina catalyst with thiophene/H/sub 2/ mixtures was studied by a gravimetric technique. Thiophene conversions were separately measured using a catalytic microreactor. Simultaneous measurements of catalyst changes and reactivity were also carried out in a stirred, microbalance reactor. Runs were made on oxidized, prereduced and presulfided catalysts. The results of sulfiding the catalyst with thiophene were similar to those previously obtained with H/sub 2/S. The predominant reaction was exchange of reactive O for S, with some anion vacancies also being formed. Prereduced catalysts sulfided to a lesser extent than the oxidized catalyst. Thiophene conversion varied with catalyst pretreatment and time on stream. A correlation between catalyst activity and catalyst surface concentrations is proposed based on dual sites consisting of anion vacancies and surface sulfide--oxide sites. It is supposed that the former are sites for thiophene adsorption and the latter for hydrogen adsorption and transfer.

• OSTI ID: 5360820
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 47:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESULFURIZATION
HETEROCYCLIC COMPOUNDS
HYDROGENATION
KINETICS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS