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A catalyst composition that is especially useful in the hydroconversion of pitch, micro carbon residue and sulfur contents of a heavy hydrocarbon feedstock without the excessive formation of sediment. The catalyst composition is a reasonably high surface area composition containing alumina and a low

A catalyst composition that is especially useful in the hydroconversion of pitch, micro carbon residue and sulfur contents of a heavy hydrocarbon feedstock without the excessive formation of sediment. The catalyst composition is a reasonably high surface area composition containing alumina and a low molybdenum content with a high ratio of nickel-to-molybdenum. The catalyst composition further has a unique pore distribution that in combination with the special metals loading provide for good conversion of pitch and micro carbon residue without an excessive yield of sediment.

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1. A non-impregnated catalyst composition providing for a high conversion of pitch and MCR with a minimal amount of sediment formation when used in the hydroprocessing of a heavy hydrocarbon feedstock, wherein said non-impregnated catalyst composition comprises: alumina powder that has a material ab

1. A non-impregnated catalyst composition providing for a high conversion of pitch and MCR with a minimal amount of sediment formation when used in the hydroprocessing of a heavy hydrocarbon feedstock, wherein said non-impregnated catalyst composition comprises: alumina powder that has a material absence of phosphorus and consists essentially of alumina;a molybdenum component in an amount of greater than or equal to 5 wt. % and less than 11 wt. %, with the wt. % being based on the total weight of said non-impregnated catalyst composition and assuming said molybdenum component is in the oxide form (MoO3) regardless of its actual form;a nickel component present in an amount such that said non-impregnated catalyst composition has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25, with said weight ratio being computed assuming said nickel component and said molybdenum component are each in the oxide form regardless of their actual forms,wherein said non-impregnated catalyst composition has a total surface area in the range of from 240 m2/g to 360 m2/g, a total pore volume in the range of from 0.65 cc/g to 1.1 cc/g and a pore size distribution such that from 11% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å, and having a pore size distribution such that from 50% to 80% of the total pore volume of said non-impregnated catalyst composition is present as pores having diameters in the range of from 55 Å to 115 Å. 2. A non-impregnated catalyst composition as recited in claim 1, wherein more than 20% of the total pore volume of said non-impregnated catalyst composition is present in pores of diameter in the range of from 50 Å to 100 Å, and less than 30% of the total pore volume of said non-impregnated catalyst composition is present in pores of diameter in the range of from 100 Å to 200 Å. 3. A non-impregnated catalyst composition as recited in claim 2, wherein the pore structure of said non-impregnated catalyst composition is such that from 19.5% to 37% of its total pore volume of said non-impregnated catalyst composition is present as pores having diameters of greater than or equal to 160 Å. 4. A non-impregnated catalyst composition as recited in claim 3, wherein said non-impregnated catalyst composition is prepared by mixing said alumina powder, a nickel compound, and a molybdenum compound to provide a co-mulled mixture, comprising said nickel compound, said molybdenum compound and alumina; forming an agglomerate of said co-mulled mixture; and calcining said agglomerate in air without added steam under calcination conditions to thereby provide said non-impregnated catalyst composition. 5. A catalyst composition as recited in claim 1, wherein said total pore volume of the catalyst composition is in the range of from 0.75 to 1 cc/g. 6. A catalyst composition as recited in claim 5, wherein said molybdenum component is present in said catalyst composition in the range of from 8 wt. % to 10 wt. % and said weight ratio of said nickel component-to-said molybdenum component is in the range of from 0.27 to 0.8. 7. A process for the hydroconversion of a heavy hydrocarbon feedstock, wherein said process comprises: contacting under suitable hydroconversion conditions said heavy hydrocarbon feedstock with the catalyst composition of claim 1. 8. A catalyst composition, comprising: a calcined agglomerate of a co-mulled mixture of alumina powder, which has a material absence of phosphorus and consists essentially of alumina, a nickel compound, and a molybdenum compound,wherein said calcined agglomerate comprises: a molybdenum component present in an amount in the range of from greater than or equal to 5 wt. % to 11 wt. %,wherein the wt. % is based on the total weight of said calcined agglomerate and assuming said molybdenum component is in the oxide form (i.e., MoO3) regardless of its actual form; and a nickel component present in said calcined agglomerate in an amount such that said calcined agglomerate has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25,wherein said weight ratio is computed assuming said nickel component and said molybdenum component are each in their oxide form (i.e., NiO and MoO3) regardless of their actual forms, andwherein said calcined agglomerate has a total surface area in the range of from 240 m2/g to 360 m2/g, a total pore volume in the range of from 0.7 cc/g to 1.05, and a pore size distribution such that from 11.8% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å, and having a pore size distribution such that from 50% to 80% of the total pore volume of said catalyst composition is present as pores having diameters in the range of from 55 Å to 115 Å. 9. A catalyst composition as recited in claim 8, wherein said catalyst composition has a total pore volume and a pore diameter distribution whereby from 55% to 80% of the total pore volume of said catalyst composition is present as pores of diameter in the range of from 55 Å to 115 Å, from 19.5% to 37% of the total pore volume of said catalyst composition is present as pores having diameters of at least 160 Å, and having a pore size distribution such that from 50% to 80% of the total pore volume of said catalyst composition is present as pores having diameters in the range of from 55 Å to 115 Å. 10. A method of making a catalyst composition, wherein said method comprises: mixing alumina powder, which has a material absence of phosphorus and consists essentially of alumina, a nickel compound, and a molybdenum compound to provide a co-mulled mixture;forming an agglomerate of said co-mulled mixture; andheat-treating said agglomerate to provide said catalyst composition;wherein an amount of said alumina powder, an amount of said nickel compound and an amount of said molybdenum compound provided in said mixing step are such that said catalyst composition contains a molybdenum component present therein in an amount of greater than or equal to 5 wt. % and less than 11 wt. %, with the wt. % being based on the total weight of said catalyst composition and assuming said molybdenum component is in the oxide form (MoO3) regardless of its actual form, and a nickel component present in said catalyst composition in an amount such that said catalyst composition has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25, with said weight ratio being computed assuming said nickel component and said molybdenum component are each in the oxide form regardless of their actual forms, and wherein said catalyst composition has a total surface area in the range of from 240 m2/g to 360 m2/g, a total pore volume in the range of from at least 0.65 cc/g to 1.1 cc/g and a pore size distribution such that from 11% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å, and having a pore size distribution such that from 50% to 80% of the total pore volume of said catalyst composition is present as pores having diameters in the range of from 55 Å to 115 Å. 11. A catalyst composition comprising: alumina powder that has a material absence of phosphorus and consists essentially of alumina;a molybdenum component in an amount in the range of from 5 wt. % to 11 wt. %, with the wt. % being based on the total weight of said catalyst composition and assuming said molybdenum component is in the oxide form (MoO3) regardless of its actual form; anda nickel component present in an amount such that said catalyst composition has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25, with said weight ratio being computed assuming said nickel component and said molybdenum component are each in the oxide form regardless of their actual forms, and wherein said catalyst composition has a total surface area in the range of from 240 m2/g to 360 m2/g, and a pore size distribution such that from 11.8% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å and no more than 0.3 cc/g of total pore volume is present in macropores of a diameter greater than or equal to 250 Å. 12. A catalyst composition as recited in claim 11, having a pore size distribution such that from 50% to 80% of the total pore volume of said catalyst composition is present as pores of diameter in the range of from 55 Å to 115 Å, and from 18% to 28% of the total pore volume of said catalyst composition is present in pores of diameter greater than 500 Å. 13. A catalyst composition as recited in claim 12, wherein the catalyst composition is prepared by mixing said alumina powder, a nickel compound, and a molybdenum compound to provide a co-mulled mixture, comprising said nickel compound, said molybdenum compound and alumina; forming an agglomerate of said co-mulled mixture; and calcining said agglomerate in air without added steam under calcination conditions to thereby provide said catalyst composition. 14. A catalyst composition, comprising: a calcined agglomerate of a co-mulled mixture of alumina powder, which has a material absence of phosphorus and consists essentially of alumina, a nickel compound, and a molybdenum compound;wherein said calcined agglomerate comprises: a molybdenum component present in an amount of greater than or equal to 5 wt. % and less than 11 wt. %, wherein the wt. % is based on the total weight of said calcined agglomerate and assuming said molybdenum component is in the oxide form (i.e., MoO3) regardless of its actual form; anda nickel component present in said calcined agglomerate in an amount such that said calcined agglomerate has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25, wherein said weight ratio is computed assuming said nickel component and said molybdenum component are each in their oxide form (i.e., NiO and MoO3) regardless of their actual forms, andwherein said calcined agglomerate has a total surface area in the range of from 240 m2/g to 360 m2/g, a total pore volume in the range of from 0.7 cc/g to 1.05 cc/g, and a pore size distribution such that from 11% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å, and wherein said catalyst composition has a total pore volume and a pore diameter distribution whereby from 50% to 62.8% of the total pore volume of said catalyst composition is present as pores of diameter in the range of from 55 Å to 115 Å, from 20% to 30.5% of the total pore volume of said catalyst composition is present as pores having diameters greater than or equal to 160 Å. 15. A catalyst composition as recited in claim 14, wherein said total pore volume of the catalyst composition is in the range of from 0.75 to 1 cc/g. 16. A method of making a catalyst composition, wherein said method comprises: mixing alumina powder, which has a material absence of phosphorus and consists essentially of alumina, a nickel compound, and a molybdenum compound to provide a co-mulled mixture;forming an agglomerate of said co-mulled mixture; andheat-treating said agglomerate to provide said catalyst composition;wherein an amount of said alumina powder, an amount of said nickel compound and an amount of said molybdenum compound provided in said mixing step are such that said catalyst composition contains a molybdenum component present therein in an amount greater than or equal to 5 wt. % and less than 11 wt. %, with the wt. % being based on the total weight of said catalyst composition and assuming said molybdenum component is in the oxide form (MoO3) regardless of its actual form, and a nickel component present in said catalyst composition in an amount such that said catalyst composition has a weight ratio of said nickel component-to-said molybdenum component exceeding 0.25, with said weight ratio being computed assuming said nickel component and said molybdenum component are each in the oxide form regardless of their actual forms, and wherein said catalyst composition has a total surface area in the range of from 240 m2/g to 360 m2/g, a total pore volume in the range of from 0.75 cc/g to 1 cc/g and a pore size distribution such that from 11% to 30.5% of the total pore volume is present in macropores of diameter greater than or equal to 250 Å.