| abstract |
A catalyst containing a sulfide phase comprising (a) sulfur (b) and at least one element A selected form group IIIB, including the lanthanides and actinides, group IVB and group VB, and optionally (c) at least one element B selected from group VIIB and group VIII and mixtures thereof, is suitable for use in, for example, hydrorefining or hydroconversion. Sulfur is present in the catalyst at a quantity higher than the quantity corresponding to 40% of the stoichiometric quantity of sulfur in the sulfide compounds of elements from groups MB, IVB, VB, VIIB and VIII. The catalyst also, optionally, comprises at least one porous amorphous or low crystallinity type matrix. |