Catalytic functionalities of supported sulfides. II. Effect of support on Mo dispersion

Journal Article · Sun Jan 01 00:00:00 EST 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90109-X· OSTI ID:5152396

Massoth, F E; Muralidhar, G; Shabtai, J

Several Mo and CoMo catalysts on different supports, previously evaluated for thiophene hydrodesulfurization (HDS) and 1-hexene hydrogenation (HYD) activities, were characterized for Mo dispersion in the catalysts. Techniques employed for characterization included XRD, ESCA, and O/sub 2/ chemisorption of catalysts, and determination of ''active OH'' on supports. For the calcined (oxide) form of Mo and CoMo catalysts on Al/sub 2/O/sub 3/, several SiO/sub 2/-Al/sub 2/O/sub 3/ compositions, and SiO/sub 2/, it was found that essentially monolayer dispersion of the Mo was present on Al/sub 2/O/sub 3/ and low SiO/sub 2/-containing supports, whereas in the case of high SiO/sub 2/-containing and SiO/sub 2/ supports evidence was found for three-dimensional crystallites for the Mo phase. The sulfided form of these catalysts gave essentially the same results. These findings are interpreted in terms of the degree of interaction of the Mo phase with the support. To account for changes in HDS and HYD activities of the catalysts, it is proposed that HDS occurs at vacancies on corner sites and HYD at vacancies on edge sites of the MoS/sub 2/ phase present. 5 figures, 5 tables.

• Research Organization: Univ. of Utah, Salt Lake City
• OSTI ID: 5152396
• Journal Information: J. Catal.; (United States), Vol. 85:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COBALT
CALCINATION
CATALYTIC EFFECTS
STRUCTURAL CHEMICAL ANALYSIS
MOLYBDENUM
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CHEMISORPTION
COBALT SULFIDES
DISPERSIONS
ELECTRON SPECTROSCOPY
MOLYBDENUM SULFIDES
OXYGEN
SILICON OXIDES
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
ELEMENTS
METALS
MOLYBDENUM COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SCATTERING
SEPARATION PROCESSES
SILICON COMPOUNDS
SORPTION
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures