CATALYST FOR HYDROREFINING HYDROCARBON FEEDSTOCK OIL CONTAINING NIOBIUM TRISULFIDE, AND HYDROREFINING PROCESS USING SAID CATALYST

摘要

PURPOSE: To improve catalytic activity for hydrodesulfurization and hydrodenitrification in hydrorefining of hydrocarbon feedstock oil by containing bulk niobium trisulfide. ;CONSTITUTION: Niobium trisulfide which is synthesized difficultly and unstable in atmosphere not rich in sulfur exhibits eminent catalytic activity. The catalyst may be bulk niobium sulfide or supported niobium sulfide. Bulk niobium trisulfide is prepared by heating the stoichiometric ratio of niobium and sulfur under the autogeneous pressure in the absence of air. By lowering the reaction temp., not only loss of sulfur is prevented, but also the specific surface area of produced niobium trisulfide is increased, thus preparation is carried out at a temp. of 450-750C, preferably 450-550C. Besides, the specific surface area is increased by introduction of lithium and removal thereof. Further, catalytic activity of the obtained niobium trisulfide is increased more by impregnating an inert carrier of carbon or silica with a niobium succinate soln., drying it and sulfiding it.;COPYRIGHT: (C)1995,JPO