MIXED OXIDES OF TRANSITION METALS, HYDROTREATMENT CATALYSTS OBTAINED THEREFROM, AND PREPARATION PROCESS COMPRISING SOL-GEL PROCESSES

摘要

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); X_a Y_b Z_c O_d.pC   (A);possibly shaped without a binder, or by sulfidation of mixed oxides having formula (A), in shaped form with a binder,wherein X is selected from Ni, Co and mixtures thereof,Y is selected from Mo, W and mixtures thereof,Z is selected from Si, Al and mixtures thereof,O is oxygen,C is selected from: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:a) an alkyl ammonium hydroxide having formula (I); R^IR^IIR^IIIR^IVNOH   (I);wherein the groups R^IR^IV, the same or different, are aliphatic groups containing from 1 to 7 carbon atoms,b) an amine having formula (II); R¹R²R³N   (II)wherein R¹ is a linear, branched or cyclic alkyl, containing from 4 to 12 carbon atoms, andR² and R³, 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. R¹,a, b, c, d are the number of moles of the elements X,Y, Z, O, respectively,p is the weight percentage of C with respect to the total weight of the precursor having formula (A),a, b, c, d are higher than 0a/b is higher than or equal to 0.3 and lower than or equal to 2,(a+b)/c is higher than or equal to 0.3 and lower than or equal to 10, preferably varying from 0.8 to 10d=(2a+6b+Hc)/2 whereinH=4 when Z=SiH=3 when Z=Aland p is higher than or equal to 0 and lower than or equal to 40%.Said catalysts can be used as hydrotreating catalysts.