Hydrocracking with aqueous phosphomolybdic acid

Claim 1

In a method for preparing a catalyst wherein aqueous phosphomolybdic acid is heated in the presence of a hydrocarbonaceous material and a gas selected from the group consisting of a hydrogen-containing gas, a hydrogen sulfide-containing gas and mixtures thereof to convert said phosphomolybdic acid to a solid catalyst, the improvement which comprises: (a) forming a mixture of a first hydrocarbonaceous material comprising at least about 10 weight percent constituents boiling above about 1050° F. and said aqueous solution of phosphomolybdic acid in an amount to provide in said mixture from about 0.2 to 2 weight percent molybdenum, calculated as elemental metal, based on said first hydrocarbonaceous material, said aqueous solution comprising from about 3 to about 5 weight percent molybdenum derived from said phosphomolybdic acid to produce a catalyst precursor concentrate; (b) introducing at least a portion of said catalyst precursor concentrate into a second hydrocarbonaceous material having a different boiling point range from said first hydrocarbonaceous material; (c) heating the mixture resulting from step (a) or the mixture resulting from step (b) in the presence of a gas selected from the group consisting of hydrogen-containing gas, hydrogen sulfide-containing gas, and mixtures thereof at conditions to convert said phosphomolybdic acid to a solid molybdenum-containing catalyst.