Use of charge-containing molecules linked with covalent bonds to enhance acetylene hydrogenation catalysts

Patent metadata

Field	Value
Publication number	US-10245583-B1
Application number	US-201715702413-A
Country	US
Kind code	B1
Filing date	Sep 12, 2017
Priority date	Sep 12, 2017
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A composition containing a supported hydrogenation catalyst comprising palladium and a support, wherein the supported hydrogenation catalyst is capable of selectively hydrogenating highly unsaturated hydrocarbons to unsaturated hydrocarbons, and a dopant, wherein the dopant comprises at least one component selected from zwitterions, ylides, betaines, or combinations thereof. A method of making a selective hydrogenation catalyst by contacting a support with a palladium-containing compound to form a supported-palladium composition, contacting the supported-palladium composition with a dopant to form a selective hydrogenation catalyst precursor, wherein the dopant comprises at least one component selected from zwitterions, ylides, betaines, or combinations thereof, and reducing the selective hydrogenation catalyst precursor to form the selective hydrogenation catalyst. A selective hydrogenation catalyst produced via the method of making a selective hydrogenation catalyst, and a method of selectively hydrogenating highly unsaturated hydrocarbons to an unsaturated hydrocarbon enriched composition are also provided.

First claim

What is claimed is:

1. A composition comprising:
a supported hydrogenation catalyst comprising palladium and an inorganic support selected from the group consisting of aluminas, silicas, titanias, zirconias, aluminosilicates, spinels, and combinations thereof, wherein the supported hydrogenation catalyst is capable of selectively hydrogenating highly unsaturated hydrocarbons to unsaturated hydrocarbons; and
a dopant, wherein the dopant comprises at least one component selected from the group consisting of zwitterions, ylides, betaines, and combinations thereof.

2. The composition of claim 1 , wherein the dopant is selected from ylides.

3. The composition of claim 2 , wherein the dopant is selected from phosphorus ylides.

4. The composition of claim 3 , wherein the dopant is selected from phosphorus ylides further comprising a carbonyl group.

5. The composition of claim 2 , wherein the ylide is classified as stabilized and of the form R 1 3 —P═CHR 2 , wherein R 2 comprises a COX group or a CN group.

6. The composition of claim 5 , wherein the ylide is a phosphoranylidine selected from the group consisting of 1-(triphenylphosphoranylidene)-2-propanone (TPP-2P), 2-(Triphenylphosphoranlyidene) propionaldehyde, (triphenylphosphoranylidene)acetonitrile, (triphenylphosphoranlyidene) acetaldehyde, (triphenylphosphoranlyidene)ketene, (phenacylidene)triphenylphosphorane, ethyl(triphenylphosphoranylidene)pyruvate, and combinations thereof.

7. The composition of claim 1 , wherein the dopant has a boiling point of greater than or equal to about 200° C.

8. The composition of claim 1 further comprising at least one selectivity enhancer selected from the group consisting of Group 1B metals, Group 1B metal compounds, silver compounds, fluorine, fluoride compounds, sulfur, sulfur compounds, alkali metal, alkali metal compounds, alkaline metals, alkaline metal compounds, iodine, iodide compounds, and combinations thereof disposed on the inorganic support.

9. The composition of claim 1 , wherein the palladium is present in an amount of from about 0.005 wt. % to about 5 wt. % based on the total weight of the catalyst.

10. The composition of claim 1 , wherein the dopant is present in an amount of from about 0.005 wt. % to about 5 wt. % based on the total weight of the catalyst.

11. The composition of claim 1 , wherein the inorganic support has a surface area of from about 2 m 2 /g to about 100 m 2 /g, and wherein greater than about 90 wt. % of the palladium is concentrated near a periphery of the inorganic support.

12. A method of making a selective hydrogenation catalyst, the method comprising:
contacting an inorganic support selected from the group consisting of aluminas, silicas, titanias, zirconias, aluminosilicates, spinels, and combinations thereof with a palladium-containing compound to form a supported-palladium composition;
contacting the supported-palladium composition with a dopant to form a selective hydrogenation catalyst precursor, wherein the dopant comprises at least one component selected from the group consisting of zwitterions, ylides, betaines, and combinations thereof; and
reducing the selective hydrogenation catalyst precursor to form the selective hydrogenation catalyst.

13. The method of claim 12 , wherein the dopant is selected from ylides.

14. The method of claim 13 , wherein the dopant is selected from phosphorus ylides.

15. The method of claim 14 , wherein the dopant is selected from phosphorus ylides further comprising a carbonyl group.

16. The method of claim 13 , wherein the ylide is classified as stabilized and of the form R 1 3 —P═CHR 2 , wherein R 2 comprises a COX group or a CN group.

17. The method of claim 16 , wherein ylide is a phosphoranylidine selected from the group consisting of 1-(triphenylphosphoranylidine)-2-propanone (TPP-2P), (triphenylphosphoranylidene) acetonitrile, (triphenylphosphoranlyidene)ketene, (phenacylidene)triphenylphosphorane, (triphenyl phosphoranlyidene)acetaldehyde, ethyl(triphenylphosphoranylidene)pyruvate, 2-(triphenyl phosphoranlyidene) propionaldehyde, and combinations thereof.

18. The method of claim 12 , wherein the dopant has a boiling point of greater than or equal to about 200° C.

19. The method of claim 12 , further comprising contacting the inorganic support, the supported-palladium composition, the selective hydrogenation catalyst precursor, or the selective hydrogenation catalyst with at least one selectivity enhancer selected from the group consisting of Group 1B metals, Group 1B metal compounds, silver compounds, fluorine, fluoride compounds, sulfur, sulfur compounds, alkali metal, alkali metal compounds, alkaline metals, alkaline metal compounds, iodine, iodide compounds, and combinations thereof.

20. The method of claim 19 , wherein the selectivity enhancer comprises elemental silver, silver nitrate, silver acetate, silver bromide, silver chloride, silver iodide, silver fluoride, or a combination thereof.

21. The method of claim 19 , wherein the selectivity enhancer comprises elemental alkali metal, alkali metal fluoride, alkali metal chloride, alkali metal bromide, alkali metal iodide, alkali metal oxide, alkali metal carbonate, alkali metal sulfate, alkali metal phosphate, alkali metal borate, potassium fluoride, or a combination thereof.

22. The method of claim 19 , wherein the selectivity enhancer comprises silver and potassium fluoride.

23. The method of claim 19 , wherein the selectivity enhancer is present in an amount of from about 0.005 wt. % to about 5 wt. % based on the total weight of the selective hydrogenation catalyst.

24. The method of claim 19 , wherein contacting the inorganic support, the supported-palladium composition, the selective hydrogenation catalyst precursor, or the selective hydrogenation catalyst with the at least one selectivity enhancer comprises incipient wetness impregnation.

25. The method of claim 12 , wherein the palladium is present in an amount of from about 0.005 wt. % to about 5 wt. % Pd based on the total weight of the selective hydrogenation catalyst.

26. The method of claim 12 , wherein the dopant is present in an amount of from about 0.005 wt. % to about 5 wt. % based on the total weight of the selective hydrogenation catalyst.

27. A selective hydrogenation catalyst prepared according the method of claim 12 .

28. The method of claim 12 , wherein contacting the inorganic support with the palladium-containing compound to form the supported-palladium composition and contacting the supported-palladium composition with the dopant comprise incipient wetness impregnation.

29. A method of selectively hydrogenating highly unsaturated hydrocarbons to an unsaturated hydrocarbon enriched composition, the method comprising:
contacting a supported catalyst comprising palladium and a dopant with a feed comprising highly unsaturated hydrocarbon under conditions suitable for hydrogenating at least a portion of the highly unsaturated hydrocarbon feed to form the unsaturated hydrocarbon enriched composition, wherein the dopant comprises at least one component selected from the group consisting of zwitterions, ylides, betaines, and combinations thereof.

30. The method of claim 29 , wherein the highly unsaturated hydrocarbons comprise at least one component selected from the group consisting of acetylene, methylacetylene, propadiene, bu

Assignees

• Chevron Phillips Chemical Co Lp

Inventors

• Snell Ryan W
• Hong Zongxuan

Classifications

• B01J21/04

  Alumina · CPC title

• B01J31/28

  of the platinum group metals, iron group metals or copper · CPC title

• B01J31/00

  Catalysts comprising hydrides, coordination complexes or organic compounds (catalyst compositions used only in polymerisation reactions C08 {; catalytic antibodies C12N9/0002}) · CPC title

• B01J31/0267 Primary

  Phosphines or phosphonium compounds, i.e. phosphorus bonded to at least one carbon atom, including e.g. sp2-hybridised phosphorus compounds such as phosphabenzene, the other atoms bonded to phosphorus being either carbon or hydrogen · CPC title

• B01J37/0201

  Impregnation · CPC title