Sulfidability and hydrodesulfurization activity of Mo catalysts supported on alumina, silica, and carbon

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90167-4· OSTI ID:6855662

Scheffer, B; Arnoldy, P; Moulijn, J A ^[1]

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1. Univ. of Amsterdam (Netherlands)

The sulfidability and hydrodesulfurization (HDS) activity of Mo catalysts supported on SiO{sub 2}, carbon and Al{sub 2}O{sub 3} have been studied. The results are interpreted on the basis of differences in dispersion, and interaction of the Mo species with the support. Crystalline MoO{sub 3} with a low dispersion is relatively difficult to sulfide. Large MoO{sub 3} crystallites are found on some Mo/SiO{sub 2} catalysts, which necessitates sulfiding above 670 K. The HDS activity of these catalysts is low because the dispersion of the sulfided species is also low. On all supports highly disperse oxidic species are readily sulfidable. On carbon microcrystalline MoS{sub 2} is formed which is highly active for HDS. The carbon support is not gasified during sulfiding. Also on SiO{sub 2} an easily sulfided species displays high HDS activity. Al{sub 2}O{sub 3}-supported Mo catalysts are more difficult to sulfide, because of the strong interaction with the support. It is found that two oxidic Mo species are present on Al{sub 2}O{sub 3}, but only one (a bilayer species) is a precursor to a highly active sulfided species. The monolayer species has a much smaller HDS activity when sulfided. A good correlation is found between the reducibility of oxidic species and their HDS activity with the support. A strong interaction decreases the covalent character of the Mo-S bond, resulting in a lower activity.

• OSTI ID: 6855662
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 112:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400 -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DESULFURIZATION
ELEMENTS
HIGH TEMPERATURE
METALS
MINERALS
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MOLYBDENUM SULFIDES
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
REFRACTORY METAL COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
SYNTHESIS
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS