The process comprising compositing a quantity of a particulate, porous catalyst support material comprising one or more refactory oxides with one or more catalyst precursor salts and heating the composite at elevated temperature of at least about 200/sup 0/C up to about 600/sup 0/, in the presence of a sulfur-bearing compound in an amount whereby sulfur in the form of the sulfur-bearing compound in an amount whereby sulfur in the form of the sulfur bearing compound is present in excess of that contained in the catalyst precursor and under more » oxygen-free conditions for a time sufficient to form the catalyst. This patent describes the process for preparing a supported hydroprocessing catalyst. The contacting occurs for a time sufficient to hydrotreat at least a portion of the feed. The precursor salt contains a tetrathiometallate anion of Mo, W more » or mixture thereof and a cation comprising trivalent chromium or a mixture of trivalent chromium with one or more divalent promoter metals selected from the group consisting of Fe, Ni, Co, Mn, Zn, and Cu wherein the trivalent chromium and divalent promoter metals are chelated by at least one neutral, nitrogen-containing polydentate ligand, L. Then the composite is heated at elevated temperature of at least about 150/sup 0/C., in the presence of excess sulfur in the form of one or more sulfur-bearing compounds and under oxygen-free conditions for a time sufficient to form the catalyst. and in the presence of hydrogen with a catalyst obtained by compositing a quantity of inorganic refractory oxide support material with one or more precursor salts. « lessĪ process is described for hydrotreating a hydrocarbon feed which comprises contacting the feed at a temperature of at least about 150/sup 0/C.
The catalyst has been prepared by compositing a pre-selected quantity of inorganic refractory oxide support more » material with (a) a hydrated oxide of trivalent chromium and (b) one or more catalyst precursor salts containing a thiometalate anion of Mo, W or mixture thereof and a cation containing at least one of the promoter metals wherein the promoter metal in the cation is divalent and is chelated by at least one neutral, nitrogen-containing polydenate ligand and heating the composite at elevated temperature, in the presence of sulfur or sulfur bearing compound and under oxygen-free conditions for a time sufficient to form the catalyst, the contacting of the feed with the catalyst occurring for a time sufficient to improve the oxidation stability of the oil. The precursor comprises a mixture of (i) a hydrated oxide of trivalent chromium and (ii) a thiometallate salt of the general formula (ML)(Mo/sub y/W/sub 1-y/S/sub 4/) wherein M is one or more of the divalent promoter metals selected from the group consisting of Ni, Co, Mn, Zn, Cu, mixtures thereof and mixtures thereof with Fe, wherein Y is any value ranging from 0 to 1, L is one or more neutral, nitrogen-containing ligands, at least one of which is a chelating polydentate = ,Ī process is described for improving the oxidation stability of a nitrogen and sulfur containing lube oil feed which comprises contacting the feed at an elevated temperature of at least about 150/sup 0/C and in the presence of hydrogen with a catalyst comprising a support mixture of a sulfide of (i) trivalent chromium, (ii) Mo, W or mixture thereof and (iii) at least one promoter metal selected from the group consisting of Ni, Co, Mn, Cu, Zn and mixture thereof and mixture thereof with Fe.
A process is described for preparing a catalyst comprising a mixture of (i) an amorphous sulfide of trivalent chromium, (ii) microcrystallites of a metal sulfide of a metal selected from the group consisting of Mo, W, and mixtures thereof, and (iii) a sulfide of at least one promoter metal selected from the group consisting of Ni, Co, Mn, Zn, Cu, mixtures thereof and mixtures thereof with Fe, the process comprising heating a precursor at a temperature of at least about 200/sup 0/C., in the presence of sulfur and under oxygen free conditions for a time sufficient to form the catalyst.