Preparation of High-Activity MgO-Supported Co–Mo and Ni–Mo Sulfide Hydrodesulfurization Catalysts

CoO–MoO3/MgO and NiO–MoO3/MgO catalysts were prepared from MoO3/MgO by impregnation with methanol solutions of Co nitrate and Ni nitrate, respectively, followed by calcination at 350°C. The texture of the starting MoO3/MgO was preserved during this preparation. The hydrodesulfurization activity of t...

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Bibliographic Details
Published inJournal of catalysis Vol. 206; no. 2; pp. 314 - 320
Main Authors Klicpera, T., Zdražil, M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 10.03.2002
Elsevier
Subjects
benzothiophene
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
hydrodesulfurization
MgO support
sulfide catalysts
synergistic effect
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
MgO support
benzothiophene
hydrodesulfurization
sulfide catalysts
synergistic effect
Mixed catalyst
Five membered ring
Molybdenum Sulfides
Transition metal Compounds
Cobalt Sulfides
Nickel Sulfides
Supported catalyst
Heterogeneous catalysis
Sulfur heterocycle
Preparation
Bicyclic compound
Aromatic compound
Magnesium Oxides
Hydrodesulfurization
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Summary:CoO–MoO3/MgO and NiO–MoO3/MgO catalysts were prepared from MoO3/MgO by impregnation with methanol solutions of Co nitrate and Ni nitrate, respectively, followed by calcination at 350°C. The texture of the starting MoO3/MgO was preserved during this preparation. The hydrodesulfurization activity of the presulfided catalysts was evaluated using the reaction of benzothiophene (1.6 MPa, 300–360°C). Commercial CoMo/Al2O3 (Shell 344) and NiMo/Al2O3 (Shell 324) catalysts were used as reference points of activity. A strong synergistic effects in activity between Co(Ni) and Mo in Co(Ni)Mo/MgO catalysts was observed with an optimum Co(Ni)O content of about 3–4 wt%. The most active Co(Ni)Mo/MgO catalysts were 1.5 to 2.3 times more active than their corresponding Al2O3-supported counterparts. MgO should be considered a new promising support for Co(Ni)Mo sulfide catalysts. However, its sensitivity to water and propensity to form solid solutions with CoO and NiO must be taken into consideration in catalyst preparation.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.2001.3488