Group VIII and VIB metal sulfide catalysts, their manufacture and their use for hydrotreating hydrocarbon cuts containing sulfur
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United States of America Patent
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Jun 24, 1986
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N/A
app pub date -
Sep 24, 1984
filing date -
Oct 25, 1983
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Expired
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Abstract
This invention concerns a method of preparing catalysts and certain catalysts which can be obtained by the method. The method comprises (a) coprecipitating at least a group VIII metal sulfide with at least a group VIB metal sulfide, at a pH maintained at a value of 4.5 to 8; (b) separating the resultant precipitate; (c) drying the precipitate; and (d) calcining the dried precipitate; all the steps being effected under an inert atmosphere. The catalysts have a stoichiometry of 1.2 to 2.2 atoms of sulfur per metal atom, a crystallographic structure of molybdenite for the group VIB metal sulfide(s) and pyrite for the group VIII metal sulfide(s) and characterized by an X-ray diffraction powder pattern having at least two principal peaks a and b of the disulfide of each group VIB metal used (peaks a, b, c, d), and two principal peaks f and j of the disulfide of each group VIII metal used, (peaks e, f, g, h, i, j, k), the height of the principal peak of a group VIII metal monosulfide (1), if it appears being less than 5 times that of the principal peak (f) of the disulfide of the same metal, which are particularly active for all reactions between hydrogen and a mixture of hydrocarbons containing sulfide compounds.
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