Patent ID: 6949686
Filing Date: 2005-09-27
Classification: C10G

Abstract:
1. In a method for stabilizing pyrolysis gasoline by the selective hydrogenation of diolefins and alkynes without substantial saturation of mono-olefins using a catalyst based on at least one Group VIII metal, the improvement comprising promoting said catalyst against at least one catalyst poison selected from the group consisting of mercury, lead, alkali metal, alkaline earth metal, phosohorus, silicon, iron, iron oxide containing rouge dust, coke, halides, nitrogen containing compounds, and silica, by employing with said catalyst a promoter which is selected from at least one material selected from the group consisting of zinc, metals of Group VI B, manganese, rhenium, and oxides thereof and supporting said catalyst on a porous alumina based support, said promoter being employed in an amount effective preferentially to trap and separate said at least one poison thereby leaving said Group VIII metal active for said selective hydrogenation, and thereby extending the active catalyst life.