Properties and Structure of Nanosized Catalyst Systems Based on Molybdenum Sulfides

The phase compositions of molybdenum sulfide-based catalysts with various S/Mo ratios which are synthesized ex situ from reverse emulsions of the aqueous solution of ammonium paramolydbate (NH 4 ) 6 Mo 7 O 24 . 4Н 2 О in the medium of vacuum residue in the presence of a sulfiding component (sulfur)...

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Bibliographic Details
Published in:Petroleum chemistry 2017-12, Vol.57 (14), p.1277-1286
Main Authors: Khadzhiev, S. N., Kadiev, Kh. M., Gul’maliev, A. M., Kadieva, M. Kh
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemical synthesis
Chemistry
Chemistry and Materials Science
Emulsions
Industrial Chemistry/Chemical Engineering
Molybdenum
Molybdenum disulfide
Molybdenum sulfides
Phase composition
Sulfides
Sulfidization
Thermodynamics
X-ray diffraction
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Summary:The phase compositions of molybdenum sulfide-based catalysts with various S/Mo ratios which are synthesized ex situ from reverse emulsions of the aqueous solution of ammonium paramolydbate (NH 4 ) 6 Mo 7 O 24 . 4Н 2 О in the medium of vacuum residue in the presence of a sulfiding component (sulfur) are studied by chemical thermodynamics and X-ray diffraction. Issues related to the interpretation of the phase composition determining properties of the catalysts are discussed in detail. It is shown that the catalyst predominantly comprising MoS 2 is formed at S/Mo above 2.5 (mol/mol) in the reverse emulsion and the content of carbon-containing components adsorbed on Мо-containing particles grows with an increase in the degree of sulfiding.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544117140043