Surface structure and catalytic activity of sulfided MoO/sub 3//Al/sub 2/O/sub 3/ catalysts: hydrodesulfurization and hydrogenation activities

Journal Article · Sat Nov 01 04:00:00 EST 1980 · J. Catal.; (United States)

OSTI ID:6557383

Okamoto, Y; Tomioka, H; Imanaka, T; Teranishi, S

The hydrogenation activities of sulfided MoO/sub 3//Al/sub 2/O/sub 3/ catalysts for the butenes produced in the hydrodesulfurization of thiophene were studied in connection with the surface structure of the catalysts. The hydrodesulfurization of thiophene was carried out at 400/sup 0/C and atmospheric pressure. It was found that the catalytic activity for the hydrogenation depended simply on the sulfidation degree of molybdenum (S/Mo by x-ray photon-electron spectroscopy) regardless of the molybdenum content, calcination temperature, and sulfidation conditions as well as for the hydrodesulfurization. In the low-sulfur-content catalysts (S/Mo < 1), the relative activity for the hydrogenation to the hydrodesulfurization was constant, implying that only one kind of molybdenum species, which is active for both reactions, is present. On the basis of the relationships between the relative activity and the sulfidation degree of molybdenum, it is suggested that two-dimensional MoS/sub 2/ (monolayer structure) is initially formed at the expense of the above species and subsequently transformed to three-dimensional MoS/sub 2/ microcrystals by further sulfidation of the catalysts, accompanying the sintering of molybdenum.

• Research Organization: Osaka Univ., Japan
• OSTI ID: 6557383
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 66:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
&amp; Peat-- Purification &amp; Upgrading
02 PETROLEUM
020400* -- Petroleum-- Processing
04 OIL SHALES AND TAR SANDS
040404 -- Oil Shales &amp; Tar Sands-- Purification
090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALKENES
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
DESULFURIZATION
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
INFORMATION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SULFIDATION
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES