Hydrogenation palladium-silver catalyst and methods
AssigneeChevron Phillips Chemical Company LP
InventorsTin-Tack Peter Cheung, Joseph J. Bergmeister, III
Life of this patent
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Abstract
A catalyst composition comprising palladium, silver and a support material (preferably alumina) is contacted with a liquid composition comprising an iodide component such as ammonium iodide, and the catalyst is then calcined. An improved process for hydrogenation, especially selectively hydrogenating acetylene (to ethylene), using this improved catalyst composition with improved conversion and deactivation.
Claims53
A catalyst composition comprising a mixture that has been calcined wherein the mixture comprises at least one palladium component, a silver component, an inorganic support material, and an iodine component selected from the group consisting of ammonium iodide, hydrogen iodide, iodine, and mixtures thereof.
A composition prepared by a method comprising the steps of:
- contacting a starting material comprising a palladium component, a silver component, and an inorganic support material with a solution comprising an iodine component selected from the group consisting of ammonium iodide, hydrogen iodide, iodine, and mixtures thereof, to provide an iodine-contacted starting material, and calcining said iodine-contacted starting material.
A catalyst composition comprising at least one palladium component, at least one silver component, an iodine component selected from the group consisting of ammonium iodide, hydrogen iodide, iodine, and mixtures thereof, and an inorganic support material.
A composition prepared by a method comprising the steps of:
- impregnating a starting material comprising palladium, silver and at least one inorganic support material with a solution comprising an iodine component, and calcining the impregnated starting material at a temperature of about 575° F. (300° C.) to about 1300° F. (704° C.) for a time period of about 0.2 to about 20 hours wherein the iodine component is selected from the group consisting or ammonium iodide, hydrogen iodide, iodine, and mixtures thereof.
A method for the manufacture of a catalyst composition which comprises the steps of:
- (1) contacting (a) a solid composition comprising palladium, silver and an inorganic support material with (b) a liquid composition comprising an iodine component for a time period of at least about 1 second, so as to produce a contacted solid composition, wherein the iodine component is selected from the group consisting of ammonium iodide, hydrogen iodide, iodine, and mixtures thereof;
- and
- (2) calcining the contacted solid composition obtained in step (1).
A method for the manufacture of a catalyst composition which comprises:
- (1) contacting an inorganic support material with a palladium component and calcining the palladium-contacted inorganic support material;
- (2) contacting the calcined palladium-contacted inorganic support material with a silver component, and calcining the silver-contacted, palladium-contacted inorganic support material;
- and
- (3) contacting the calcined silver-contacted, palladium-contacted inorganic support material with an iodine component, wherein the iodine component is selected from the group consisting of ammonium iodide, hydrogen iodide, iodine, and mixtures thereof, and calcining the iodine-contacted, silver-contacted, palladium contacted inorganic support material to form the catalyst composition.
Dependencies are inferred from the claim text.