Catalytic properties of a CoMo/Al[sub 2]O[sub 3] catalyst presulfided with alkyl polysulfides: Comparison with conventional sulfiding

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Journal of Catalysis; (United States)

OSTI ID:7279651

Gestel, J van; Leglise, J; Duchet, J C ^[1]

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1. Universite de Caen (France)

A CoMo/Al[sub 2]O[sub 3] hydrotreating catalyst has been sulfided in different ways: (i) by conventional in situ sulfiding in a high-pressure reactor with a H[sub 2]S/H[sub 2] or dimethyldisulfide (DMDS)/H[sub 2] mixture at 350[degrees]C and 4 MPa; or (ii) by a preliminary presulfidation with di-tert-nonyl or di-tert-dodecyl pentasulfides followed by one of the above conventional in situ sulfidations. The presulfidation was performed in two steps: impregnation of the oxidic catalyst with the polysulfide and then thermal treatment under flowing nitrogen at 130[degrees]C. The catalysts were evaluated for their catalytic properties at 280-350[degrees]C and 4 MPa for the simultaneous hydrodesulfurization of thiophene and hydrogenation of cyclohexene. Compared to H[sub 2]S/H[sub 2], in situ DMDS/H[sub 2] sulfiding of the CoMo/Al[sub 2]O[sub 3] catalyst enhanced the C-S hydrogenolysis at 280[degrees]C but not the hydrogenation; however, the apparent activation energy for hydrogenation was markedly increased. The presulfidation with the polysulfides following by H[sub 2]S/H[sub 2] sulfidation yielded improved activities at 280[degrees]C for both hydrogenation and C-S bond breakage and did not influence the apparent activation energies. The highest activities were obtained by combining presulfiding and DMDS/H[sub 2] sulfidation. These results are discussed in terms of the genesis of the supported sulfide phase with various sulfur species. 40 refs., 2 figs., 2 tabs.

• OSTI ID: 7279651
• Journal Information: Journal of Catalysis; (United States), Vol. 145:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COBALT COMPOUNDS
SULFIDATION
CYCLOHEXANE
HYDROGENATION
MOLYBDENUM COMPOUNDS
THIOPHENE
DESULFURIZATION
ACTIVATION ENERGY
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
HETEROGENEOUS CATALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
ALKANES
ALUMINIUM COMPOUNDS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CYCLOALKANES
ENERGY
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading
020400 - Petroleum- Processing
400201 - Chemical & Physicochemical Properties