Hydrocarbon conversion catalyst and method of preparation

A catalytic composition prepared by the method comprising the steps of (1) impregnating support particles with an aqueous impregnating solution comprising dissolved cobalt, phosphorus, at least 17 weight percent of Group VIB metal components, calculated as the trioxides, and ammonium ions in a molar concentration greater than 1.5, said solution having a pH less than about 1.0, and wherein said dissolved phosphrous, calculated as P, is in a weight ratio to the Group VIB metal trioxide of about 0.01 to about 0.5, and (2) activating the impregnated support particles.

A catalytic composition prepared by the method comprising the steps of (1) impregnating alumina-containing support particles with an aqueous impregnating solution comprising (a) at least one molybdenum compound selected from the group consisting of ammonium heptamolybdate, ammonium phosphomolybdate, and ammonium dimolybdate, (b) cobalt nitrate, and (c) orthophosphoric acid, and wherein said solution contains dissolved phosphorous, calculated as P, in a weight ratio to molybdenum trioxide of about 0.05 to about 0.2, said solution containing at least about 20 weight percent molybdenum components, calculated as MoO.sub.3, said solution having a pH less than about 1.0 and being characterized by an ultraviolet spectrum having a maximum absorbance in the range of about 1.3 to about 2.3 at a wavelength in the range of about 200 to about 210 nanometers when said solution is diluted such that the molar concentration of molybdenum (calculated as Mo) is in the range of about 0.7.times.10.sup.-4 to about 3.3.times.10.sup.-4, (2) aging said impregnated support particles, and (3) thermally activating said aged support particles.

A method for preparing a catalyst comprising the steps of (1) impregnating support particles with an aqueous solution comprising dissolved cobalt, phosphorus, and at least 17 weight percent of Group VIB metal components, calculated as the trioxides, and wherein said dissolved phosphorus, calculated as P, is in a weight ratio to the Group VIB metal trioxide of about 0.01 to about 0.5, said solution having a pH less than about 1.0 and being characterized by a maximum extinction coefficient in the ultraviolet spectrum of about 0.7.times.10.sup.4 to 1.8.times.10.sup.4 liters/cm.moles of Group VIB metal, and (2) activating the impregnated support particles.

An impregnant solution for preparing hydrocarbon conversion catalysts comprising an aqueous solution comprising dissolved cobalt, phosphorus, and at least 17 weight percent of Group VIB metal components, calculated as the trioxides, and wherein said dissolved phosphorus, calculated as P, is in a weight ratio to the Group VIB metal trioxide of about 0.1 to about 0.5, said solution has a pH less than about 1.0 and is characterized by a maximum extinction coefficient in the ultraviolet spectrum of about 0.7.times.10.sup.4 to 1.8.times.10.sup.4 liters/cm.moles of Group VIB metal.

An impregnant solution for preparing hydrocarbon conversion catalysts comprising an aqueous solution comprising dissolved phosphorus, at least 20 weight percent of Group VIB metal components, calculated as the trioxides, and a cobalt compound, soluble in acidic aqueous solution, and wherein said dissolved phosphorus, calculated as P, is in a weight ratio to the Group VIB metal of about 0.03 to about 0.40, said solution has a pH less than about 1.0 and is characterized by an ultraviolet spectrum having a maximum absorbance in the range of about 1.3 to about 2.3 at a wavelength in the range of about 200 to 210 nanometers and a maximum extinction coefficient of about 1.10.times.10.sup.4 to 1.4.times.10.sup.4 liters/cm.moles of Group VIB metal.