Selective dehydrogenation catalysts

Claim 3

The method of claim 1 wherein the platinum group metal component comprises platinum.

Claim 4

The method of claim 1 wherein the salt is sodium carbonate.

Claim 5

The method of claim 1 wherein the amount of solution is at least about 1 part by weight per weight of the composition.

Claim 6

The method of claim 3 wherein the alkaline solution contacted with the composition comprises about 1 to about 100 parts by weight of the sodiron carbonate in 1000 parts by weight of water, and wherein the catalyst contains from about 0.78 to about 1.05 weight percent sodium metal based on the weight of the catalyst.

Claim 7

The method of claim 1 wherein the filtrate has a pH above about 7.

Claim 8

The method of claim 1 wherein the composition contains chloride and wherein the catalyst contains no more than about 0.14 weight percent chloride based on the weight of the catalyst.

Claim 9

The method of claim 1 wherein the platinum group metal is platinum and the halide is a chloride, the alkaline solution comprises an aqueous solution of about 1 to about 100 parts by weight of sodium carbonate or sodium bicarbonate in 1000 parts by weight of water, the mount of solution contacted with the composition is at least 1 part by weight of solution per part by weight of the composition, and wherein the improved catalyst contains an amount of sodium in a range from about 0.78 to about 1.05 weight percent and an amount of chloride in a range from about 0.10 to about 0.12 weight percent based on the weight of the improved catalyst.

Claim 12

The method of claim 9 wherein the amount of alkaline solution contacted with the catalyst in step (a) is at least about 1 part by weight per part by weight of the composition.

Claim 13

The method of claim 9 wherein the salt in steps (a) and (c) is sodium carbonate, and wherein the catalyst contains from about 0.78 to about 1.05 weight percent sodium metal based on the weight of the catalyst.

Claim 14

The method of claim 9 wherein the halide is chloride, the amount of water in step (b) is about 1 to about 100 parts by weight per part by weight of catalyst and wherein the improved catalyst contains an amount of chloride in a range from about 0.10 to about 0.12 weight percent based on the weight of the improved catalyst.

Claim 15

The method of claim 9 wherein the composition contains chloride and wherein the improved catalyst contains an amount of sodium in a range from about 0.78 to about 1.05 weight percent and amount of chloride in a range from about 0.10 to about 0.12 weight percent based on the weight of the improved catalyst.

Claim 16

A catalyst suitable for the selective dehydrogenation of organic compounds formed by the steps comprising: (a) contacting a composition comprising a platinum group metal component and at least about 0.20 weight percent of a halide component on an alumina support material with an aqueous alkaline solution of a salt selected from the group consisting of sodium carbonate, and sodium bicarbonate, the amount of solution being in excess of the amount absorbed by the composition; (b) partitioning the composition from remaining solution to form a treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; and (c) drying the treated composition to form the catalyst comprising a platinum group metal component, a residual amount of a halide component, and at least about 0.78 weight percent of a sodium metal component on an alumina support material.

Claim 17

A catalyst suitable for the selective dehydrogenation of organic compounds formed by the steps comprising: (a) contacting a composition comprising a platinum group metal component and at least about 0.20 weight percent of a halide component on an alumina support material with an aqueous alkaline solution of a salt selected from the group consisting of sodium carbonate, and sodium bicarbonate, the amount of solution being in excess of the amount absorbed by the composition; (b) partitioning the composition from remaining solution to form a treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; and (c) drying the treated composition to form the catalyst comprising a platinum group metal component, a residual amount of a halide component, and at least about 0.78 weight percent of a sodium metal component on an alumina support material.

Claim 18

The catalyst of claim 14 wherein the platinum group metal comprises platinum.

Claim 19

The catalyst of claim 14 wherein the alumina support comprises gamma alumina.

Claim 20

The catalyst of claim 14 wherein the halide is chloride and wherein the improved catalyst contains an amount of sodium in a range from about 0.78 to about 1.05 weight percent and an amount of chloride in a range from about 0.10 to about 0.12 weight percent based on the weight of the improved catalyst.

Claim 21

A catalyst suitable for the selective dehydrogenation of dehydrogenatable organic compounds, which catalyst is formed by a process comprising: (a) contacting a composition comprising a platinum group metal component and at least about 0.20 weight, percent of a halide component on an alumina support material with an alkaline solution of a salt selected from the group consisting of sodium carbonate, and sodium bicarbonate, the mount of solution being in excess of the amount absorbed by the composition; (b) partitioning the composition from remaining solution to recover a once-treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; (c) contacting the once-treated composition from step (b) with water and recovering a water washed composition; (d) contacting the water-washed composition from step (c) with a solution of containing a sodium metal salt, the amount of solution being in excess of the mount absorbed by the composition; (e) partitioning the composition from remaining solution to recover a twice-treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; and (f) drying the twice-treated composition to form the catalyst comprising a platinum group metal component,a residual amount of a halide component, and a sodium metal component on an alumina support material, and wherein the catalyst contains from about 0.78 to about 1.05 weight percent sodium metal based on the weight of the catalyst.

Claim 22

A catalyst suitable for the selective dehydrogenation of dehydrogenatable organic compounds, which catalyst is formed by a process comprising: (a) contacting a composition comprising a platinum group metal component and at least about 0.20 weight, percent of a halide component on an alumina support material with an alkaline solution of a salt selected from the group consisting of sodium carbonate, and sodium bicarbonate, the mount of solution being in excess of the amount absorbed by the composition; (b) partitioning the composition from remaining solution to recover a once-treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; (c) contacting the once-treated composition from step (b) with water and recovering a water washed composition; (d) contacting the water-washed composition from step (c) with a solution of containing a sodium metal salt, the amount of solution being in excess of the mount absorbed by the composition; (e) partitioning the composition from remaining solution to recover a twice-treated composition containing sodium metal removed from the aqueous solution and a filtrate containing solubilized halide removed from the composition; and (f) drying the twice-treated composition to form the catalyst comprising a platinum group metal component,a residual amount of a halide component, and a sodium metal component on an alumina support material, and wherein the catalyst contains from about 0.78 to about 1.05 weight percent sodium metal based on the weight of the catalyst.

Claim 23

The catalyst of claim 18 wherein the halide is chloride and wherein the catalyst contains an mount of chloride in a range from about 0.10 to about 0.12 weight percent based on the weight of the catalyst.