Studies on molybdena catalysts. XI. Oxygen chemisorption on sulfided catalysts

Journal Article · Fri Oct 01 04:00:00 EDT 1982 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(82)90184-1· OSTI ID:6524471

Zmierczak, W; MuraliDhar, G; Massoth, F E

Catalysts containing Mo or CoMo on various supports were prepared. Oxygen chemisorption on the sulfided catalysts was measured by a flow gravimetric technique. Activities of the catalysts were determined for thiophene hydrodesulfurization (HDS) and hexene hydrogenation in a catalytic microreactor at atmospheric pressure. Oxygen chemisorption increased with adsorption temperature. A definite adsorption was only obtained at -78/sup 0/C, adsorption at higher temperatures continuing for over 4 hr. For O/sub 2/ chemisorption at -78/sup 0/C: (i) CoMo versus Mo catalysts showed only marginally higher values; (ii) O/sub 2/ chemisorption did not correlate with HDS activity; and (iii) O/sub 2/ chemisorption showed a reasonable correlation with hydrogenation activity. It is probable that O/sub 2/ chemisorption reflects the general state of dispersion of the active Mo phase rather than specific HDS or hydrogenation sites.

• Research Organization: Univ. of Utah, Salt Lake City
• OSTI ID: 6524471
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 77:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKENES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
DESULFURIZATION
ELEMENTS
HETEROCYCLIC COMPOUNDS
HEXENES
HYDROCARBONS
HYDROGENATION
KINETICS
MOLYBDENUM COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
THERMODYNAMIC ACTIVITY
THIOPHENE
TRANSITION ELEMENT COMPOUNDS