Hydrotreating catalyst composition and processes therefor and therewith

A catalyst system comprising a first catalyst composition and a second catalyst composition wherein said first catalyst composition and said second catalyst composition are present in separate stages;

• said stages are adjacent to each other but are not physically mixed or blended;
• said stages are under the same operating conditions:
• said first catalyst is a metal-promoted beta zeolite, said second catalyst composition is a ZSM-5 zeolite having impregnated thereon an activity promoter selected from the group consisting of silicon, phosphorus, sulfur, and combinations of two or more thereof;
• the metal in said metal-promoted beta zeolite is selected from the group consisting of nickel, palladium, molybdenum, gallium, platinum, copper, chromium, rhodium, rhenium, tungsten, cobalt, germanium, zirconium, titanium, ruthenium, and combinations of two or more thereof;
• and the weight ratio of said second catalyst composition to said first catalyst composition is in the range of from about 0.1:1 to about 10:1.

A process comprising contacting a fluid, which comprises a hydrocarbon, with a catalyst system under a condition sufficient to effect the conversion of said hydrocarbon to a C.sub.6 to C.sub.8 aromatic hydrocarbon wherein said catalyst system comprising a first catalyst composition and a second catalyst composition;

• said first catalyst composition and said second catalyst composition are present in separate stages;
• said stages are adjacent to each other but are not physically mixed or blended;
• said stages are under the same operating conditions:
• said first catalyst is a metal-promoted beta zeolite;
• and said second catalyst composition is a ZSM-5 zeolite having impregnated thereon an activity promoter selected from the group consisting of silicon, phosphorus, sulfur, and combinations of two or more thereof.

A process comprising contacting a fluid, which comprises a hydrocarbon, with a catalyst system under a condition sufficient to effect the conversion of said hydrocarbon to a C.sub.6 to C.sub.8 aromatic hydrocarbon wherein

• said catalyst system comprising a first catalyst composition and a second catalyst composition wherein said first catalyst composition and said second catalyst composition are separated by an inert material selected from the group consisting of glass beads, glass wool, low surface area silica, low surface area alumina, and combinations of two or more thereof;
• said first catalyst composition is produced by the steps comprising:
• (1) combining a beta zeolite with silica to form a beta zeolite mixture;
• (2) calcining said beta zeolite-silica mixture to produce a silica-bound beta zeolite;
• and (3) contacting said silica-bound beta zeolite with a metal compound under a condition effective to incorporate said metal compound or the metal into said silica-bound beta zeolite to produce said metal-promoted beta zeolite;
• and
• said second catalyst composition is a ZSM-5 zeolite having incorporated therein an activity promoter selected from the group consisting of silicon, phosphorus, sulfur, and combinations of two or more thereof.