Process for preparing a catalytic composition for the hydroconversion of petroleum fractions

A catalytic component consisting of at least one Group VIII non-noble metal and a single Group VIB metal, said catalytic component obtained by the process of reacting a solution of a soluble Group VIII metal precursor, a single soluble Group VIB metal precursor and a tetraalkyl quaternary ammonium salt at pH 5-14;

• evaporating the solution to form a crystallized complex;
• thermally treating the crystallized complex;
• and
• sulfiding the thermally treated crystallized complex to obtain the catalytic component.

A catalyst comprising a catalytic component consisting essentially of at least one Group VIII non-noble metal and a single Group VIB metal, said catalytic component obtained by the process comprising:

• a) forming a solution and mixture of precursor salts in a solvent selected from the group consisting of water, methanol, ethanol, propanol, butanol, and mixtures thereof, said precursor salt being salts of at least one Group VIII non-noble metal and a single Group VIB metal;
• b) forming a solution of a tetraalkyl quaternary ammonium salt in a solvent;
• c) forming a mixture of the solutions obtained in steps (a) and (b);
• d) adding a basic hydroxide solution and/or ammonium carbonate to the solution (c) at a pH comprised between 5 and 14;
• e) heating the solution obtained in step (d) to a temperature between 50 and 200° C.;
• f) homogenizing the solution in step (e);
• g) crystallizing the solution obtained in step (f) through evaporation of the solvent;
• h) filtering or centrifugation of the resulting crystallized suspension obtained in step (g) for the separation of the crystals and recovery of mother liquors in the event that the evaporation has not been completed;
• i) washing the solid obtained in step (h) with sufficient deionized water and/or water/alcohol mixture;
• j) drying the solid obtained in step (i) at a temperature between 50 and 300° C.;
• k) thermally treating the solid obtained in step (j) in inert atmosphere of nitrogen, helium, or argon, at a temperature between 200 and 1000° C.;
• l) sulfiding of the material obtained step (i) or in step (j) in a gaseous flow made up of 10 vol. % hydrogen sulfide or with a hydrocarbon fraction containing at least 0.2 wt. % sulfur with a hydrogen flow at a temperature between 200 and 600° C., and a pressure between 1 and 100 Kg/cm2 to obtain said catalytic component.

A catalytic composition obtained by the steps of:

• forming a first solution of a soluble Group VIII non-noble metal precursor and only one Group VIB metal precursor;
• forming a second solution containing a component selected from the group consisting of an ionic surfactant and a tetraalkyl quaternary ammonium salt, and mixing with said first solution of said Group VIII and Group VIB precursors;
• removing said solvent and crystallizing the resulting solid product;
• thermally treating the resulting solid product in an inert atmosphere at a temperature of 200° C. to 1000° C. to obtain a heat-treated product;
• and
• sulfiding the heat-treated product to obtain the catalytic composition comprising a catalytic component consisting essentially of a Group VIII non-noble metal and one Group VIB metal.