Catalyst containing metals from Group VI and VIII at least partly in the form of an heteropolyanion in the oxide precursor; its use in hydrotreatment of hydrocarbons

摘要

Catalysts containing elements of groups VI and VIII with a strong interaction in the oxide precursor form, associated with a porous matrix. The catalyst comprises an element of group VIII with Mo and/or W, the elements being partly present , in the dry state, as a heteropolyanion with a structure of the form MxAB6O24H6C(3-2x),tH2O (I), MxAB6O24H6C(4-2x), tH2O (I'), MxA2B10O38H4C(6-2x), tH2O, (I''), MxA2B10O38H4C(8-2x), tH2O (I''') and MxA2B10O38H4C(7-2x), tH2O (I''''), in which M = Co and/or Ni and/or Fe and/or Cu and/or Zn; A = a group VIII element( I and I') and one or two group VIII elements(I'', I''' and I''''); B = Mo and/or W; C = H+ and/or ammonium (NR1R2R3R4)+; R1, R2, R3, R4 = H, alkyl and/or Cs and/or K and/or Na; t = 0 - 15; x = 0 - 3/2(I), 0 - 2(I'), 0 - 3(I''), 0 - 4(I''') and 0 - 7/2(I''''). The number of bonds connecting the element(s) of group VIII to Mo and/or W of length less than or equal to 3.6degreesA is greater than 2. An Independent claim is also included for the uses of the catalyst.