Hydrotreating catalyst

A hydrotreating catalyst comprising at least one Group VI metal, metal oxide, or metal sulfide, at least one Group VIII metal, metal oxide, or metal sulfide, and a halogen supported on a carrier wherein

• (A) the catalyst comprises from about 15% to about 35% by weight of combined metal and the atomic ratio of the Group VIII metal to Group VI metal is in the range of from about 0.5:1 to about 2:1;
• (B) the catalyst contains from about 0.5 to about 10 weight percent of halogen;
• (C) the carrier comprises from about 10 to about 40% by weight of silica and from about 40 to about 90% of alumina;
• and
• (D) the catalyst is characterized as having a median pore radius of from about 20 to about 90 Angstroms, and a surface area of from about 130 to about 230 m.sup.2 /g.

A hydrotreating catalyst comprising at least one Group VI metal, metal oxide or metal sulfide, at least one Group VIII metal, metal oxide, or metal sulfide, and a halogen supported on a carrier wherein

• (A) the catalyst contains from about 20 to about 30% by weight of combined metal, and the atomic ratio of the Group VIII to Group VI metal is in the range of from about 0.5:1 to about 1.5:1;
• (B) the catalyst contains from about 1.5 to about 2.5% by weight of fluorine;
• (C) the carrier comprises from about 15 to about 30% by weight of silica and from about 50 to about 85% by weight of alumina;
• and
• (D) the catalyst is characterized as having a median pore radius of from about 20 to about 55 Angstroms at a surface area of from about 130 to about 190 m.sup.2 /g.

A hydrotreating catalyst comprising nickel, nickel oxide, or nickel sulfide, tungsten, tungsten oxide or tungsten sulfide, and fluorine supported on a carrier wherein

• (A) the catalyst contains from about 24 to about 26% by weight of combined metal and the atomic ratio of nickel to tungsten is about 1;
• (B) the catalyst contains from about 1.5 to about 2.5% by weight of fluorine;
• (C) the carrier comprises from about 15 to about 25% by weight of silica and from about 75 to about 85% by weight of alumina;
• and
• (D) the catalyst is characterized as having a median pore radius of from about 20 to about 55 Angstroms and a surface area of from about 130 to about 190 m.sup.2 /g.

A process for preparing a catalyst support comprising silica and alumina which comprises the steps of

• (A) providing an acidic silica sol;
• (B) preparing an extrudable mixture comprising the acidic silica sol, alumina and water;
• (C) extruding the mixture to form an extrudate;
• and
• (D) calcining the extrudate at an elevated temperature.

A process of preparing a hydrotreating catalyst comprising at least one Group VI metal or metal oxide, at least one Group VIII metal or metal oxide and halogen which comprises the steps of

• (A) preparing a catalyst support by the process which comprises;
• (A-1) providing an acidic silica sol;
• (A-2) preparing an extrudable mixture comprising the acidic silica sol, alumina and water;
• (A-3) extruding the mixture to form an extrudate;
• and
• (A-4) calcining the extrudate at an elevated temperature;
• (B) impregnating said support with a solution comprising at least one Group VI metal salt, at least one Group VIII metal salt and a halogen;
• (C) drying the impregnated support;
• and
• (D) calcining said dried support.