| abstract |
preparation process of a tungsten-based catalyst, usable for hydrotreating or hydrocracking. The present invention relates to a process for preparing a tungsten-based catalyst for hydrotreating or hydrocracking processes. The invention relates to a process for preparing a catalyst, permitting hydrogenation reactions in the hydrotreating and hydrocracking processes. This catalyst is prepared from at least one monomeric tungsten-based precursor (w) in monomeric or dimeric form, having at least one w = o or w-or bond or at least one w = s or w-sr bond. where [r = cxhy where x> 1 and (x-1) <y <(2x + 1) or r = if (or ') 3 or r = if (r') 3 where r '= cx' hy 'wherein x'> 1 and (x'-1) <y '<(2x' + 1)], optionally from at least one mo precursor, and eventually from at least one group viii promoter element. These precursors are deposited on an oxide support adapted to the process in which it is used, which catalyst is advantageously sulfurized before being used in that process. |