Hydrogenation catalyst and process for the selective hydrogenation of highly unsaturated hydrocarbons
AssigneeImperial Chemical Industries PLC
InventorsElizabeth A. Irvine, Martyn V. Twigg
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Abstract
A catalyst for the selective hydrogenation of highly unsaturated hydrocarbons, e.g. acetylene, in the presence of less unsaturated hydrocarbons, e.g. ethylene, comprises palladium supported on a calcined refractory material comprising a calcium aluminate cement having a Ca:Al ratio of 1:4 to 1:10, the average depth of penetration of the palladium into the catalyst pieces being less than 300 .mu.m.
Claims10
A material suitable for use as a catalyst for the selective hydrogenation of highly unsaturated hydrocarbons in the presence of less unsaturated hydrocarbons consisting essentially of palladium supported on shaped pieces of a calcined refractory composition consisting essentially of calcium aluminate cement as such or with additional alumina, said composition having a calcium:aluminum atomic ratio within the range 1:4 to 1:10, the average depth of penetration of the palladium into the shaped pieces being less than 300 .mu.m.
A precursor to a material suitable for use as a catalyst for the selective hydrogenation of highly unsaturated hydrocarbons in the presence of less unsaturated hydrocarbons, consisting essentially of a reducible palladium compound supported on shaped pieces of a calcined refractory composition consisting essentially of calcium aluminate cement as such or with additional alumina, said composition having a calcium:
- aluminum atomic ratio within the range 1:4 to 1:10, the average depth of penetration of the palladium compound into the shaped pieces being less than 300 .mu.m.
A method of making a precursor to a material suitable for use as a catalyst for the selective hydrogenation of highly unsaturated hydrocarbons in the presence of less unsaturated hydrocarbons comprising forming shaped pieces from a composition consisting essentially of calcium aluminate cement as such or with additional alumina and having a calcium:aluminum atomic ratio within the range 1:4 to 1:10, calcining said shaped pieces and impregnating said calcined shaped pieces with an impregnant consisting essentially of a reducible palladium compound to an average depth of penetration of less than 300 .mu.m.
A process for the selective hydrogenation of highly unsaturated hydrocarbons in a mixture of said highly unsaturated hydrocarbons with unsaturated hydrocarbons in a less unsaturated state comprising passing said mixture through a bed of catalyst pieces in the presence of sufficient hydrogen to hydrogenate the highly unsaturated hydrocarbons in said mixture to said less unsaturated state, said catalyst pieces consisting of palladium supported on shaped pieces of a calcined refractory composition consisting essentially of calcium aluminate cement as such or with additional alumina, said composition having a calcium:aluminum atomic ratio within the range 1:4 to 1:10, the average depth of penetration of the palladium into the shaped pieces being less than 300 .mu.m.
Dependencies are inferred from the claim text.