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US 6,281,162 B1Granted
Isomerization of olefins
AssigneeExxon Mobil Chemical Patents Inc.
InventorsRobert Scott Smith, Jos Peter Wristers
Life of this patent
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Abstract
A process for catalytically isomerizing olefins, particularly for isomerizing alkenyl bridged ring compounds to the corresponding alkylidene bridged ring compounds. The catalyst is prepared by forming a dispersion of a metallic alkali metal on a support with simultaneous exposure to oxygen.
Claims19
A method for malting an olefin isomerization catalyst comprising:
- providing a dried support having a surface area of at least about 50 m2/g;
- and
- mixing an elemental alkali metal with said dried support under conditions effective to produce a mixture comprising a dispersion of said alkali metal on said dried support, wherein said alkali metal has a melting point and said conditions comprise a temperature higher than said melting point and said conditions further comprise simultaneous exposure of said elemental alkali metal and said dried support to a gas mixture includes from 0.001 vol % to 10 vol % of oxygen and a remainder of inert gases to provide a total amount of said oxygen in said gas mixture at a molar ratio to said elemental alkali metal from about 0.05-to-1.0 to about 1.0-to-1.0.
A method for making an olefin isomerization catalyst comprising:
- providing a dried support having a surface area of at least about 100 m2/g;
- and
- mixing an elemental alkali metal with said dried support under conditions effective to produce a mixture comprising a dispersion of said alkali metal on said dried support, wherein said alkali metal has a melting point and said conditions comprise a temperature higher than said melting point and said conditions further comprise simultaneous exposure of said elemental alkali metal and said dried support to a gas mixture includes from 0.001 vol % to 10 vol % of oxygen and a remainder of inert gases to provide a total amount of said oxygen in said gas mixture at a molar ratio to said elemental alkali metal from about 0.05-to-1.0 to about 1.0-to-1.0, where said alkali metal is selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, and mixtures thereof.
Dependencies are inferred from the claim text.