| abstract |
New sulfided metal catalysts are described, containing a metal X selected from Ni, Co and mixtures thereof, a metal Y selected from Mo, W and mixtures thereof, an element Z selected from Si, Al and mixtures thereof, and possibly an organic residue, obtained by the sulfidation of mixed oxide precursors, also new, having general formula (A) n X a Y b Z c O d .pC (A)n n possibly shaped without a binder, or by sulfidation of mixed oxides having formula (A), in shaped form with a binder,n nwherein X is selected from Ni, Co and mixtures thereof,n nY is selected from Mo, W and mixtures thereof,n nZ is selected from Si, Al and mixtures thereof,n nO is oxygen,n nC is selected from:n a nitrogenated compound N, an organic residue deriving from the partial calcination of the nitrogenated compound N, said nitrogenated compound N, when present, being selected from:n na) an alkyl ammonium hydroxide having formula (I)n nn R I R II R III R IV NOH (I)n n wherein the groups R I R IV , the same or different, are aliphatic groups containing from 1 to 7 carbon atoms,n nb) an amine having formula (II)n n R 1 R 2 R 3 N (II)n wherein R 1 is a linear, branched or cyclic alkyl, containing from 4 to 12 carbon atoms, and R 2 and R 3 , the same or different, are selected from H and a linear, branched or cyclic alkyl, containing from 4 to 12 carbon atoms, said alkyl being equal to or different from. R 1 ,n na, b, c, d are the number of moles of the elements X,n nY, Z, O, respectively,n np is the weight percentage of C with respect to the total weight of the precursor having formula (A),n na, b, c, d are higher than 0n na/b is higher than or equal to 0.3 and lower than or equal to 2,n n(a+b)/c is higher than or equal to 0.3 and lower than or equal to 10, preferably varying from 0.8 to 10n nd=(2a+6b+Hc)/2 whereinn H=4 when Z=Si H=3 when Z=Aln nand p is higher than or equal to 0 and lower than or equal to 40%.n nSaid catalysts can be used as hydrotreating catalysts. |