Hydroprocessing catalyst and method for preparing it

A catalyst comprising at least one active Group VIB metal component on a porous refractory oxide comprising alumina, said catalyst with an average pore diameter greater than about 180 angstroms, with at least about 60 percent of the total pore volume distributed in pores of diameter from about 180 angstroms to about 240 angstroms, with essentially all the pores being of diameter greater than about 100 angstroms, and with less than about 10 percent of the total pore volume being in pores of diameter greater than about 300 angstroms.

A catalyst useful for removing contaminant metals from a hydrocarbon oil comprising a Group VIB and a Group VIII metal component on a porous refractory oxide consisting essentially of gamma alumina, said catalyst with an average pore diameter from about 180 to about 220 angstroms, with at least about 65 percent of the total pore volume distributed in pores of diameter from about 180 angstroms to about 240 angstroms, with essentially all the pores being of diameter greater than 100 angstroms, with greater than about 95 percent of the total pore volume being in pores of diameter greater than about 140 angstroms, with less than about 10 percent of the total pore volume being in pores of diameter greater than about 300 angstroms, with less than about 25 percent of the total pore volume being in pores of diameter greater than about 240 angstroms, with a surface area from about 100 m.sup.2 /gram to about 200 m.sup.2 /gram, and with a total pore volume between about 0.45 cc/gram and about 0.8 cc/gram.

A catalyst prepared with a porous refractory oxide support, said support comprising a narrow pore size distribution with essentially all pores being of diameter greater than about 100 angstroms, with less than about 10 percent of the total pore volume being in pores of diameter greater than 300 angstroms, and with at least about 60 percent of the total pore volume being in pores of diameter distributed over a narrow range of about 60 angstroms within the 100 angstrom range of about 140 to about 240 angstroms.

A method for preparing a catalyst comprising a porous refractory oxide support, said method comprises compounding one or more active metals with said support, said support comprising a narrow pore size distribution with essentially all pores being of diameter greater than about 100 angstroms, with less than about 10 percent of the total pore volume being in pores of diameter greater than 300 angstroms, and with at least about 60 percent of the total pore volume being in pores of diameter distributed over a narrow range of about 60 angstroms within the 100 angstrom range of about 140 to about 240 angstroms.