Claims
- 1. A catalyst composition comprising a titanium-containing support, silver, and at least one promoter element selected from the group consisting of zinc, cadmium, the lanthanide rare earths, the actinide elements, and combinations thereof, and combinations of at least one of the aforementioned elements with Group 1 and/or Group 2 elements.
- 2. The composition of claim 1 wherein silver is present in an amount greater than 0.01 and less than 20 weight percent, based on the total weight of the catalyst.
- 3. The composition of claim 1 wherein the Group 1 promoter element is selected from sodium, potassium, rubidium, or cesium; the Group 2 promoter element is selected from magnesium, calcium, or barium; and the lanthanide promoter element is selected from erbium or lutetium.
- 4. The composition of claim 1 wherein the titanium-containing support is selected from titanium dioxide, supported titanium dioxide, titanosilicates, promoter metal titanates, titanium dispersed on silica, titanium dispersed on promoter metal silicates, and mixtures thereof.
- 5. The composition of claim 4 wherein the titanium-containing support is titanium dioxide in the anatase phase.
- 6. The composition of claim 5 wherein the titanosilicate is a porous titanosilicate having pores in the range from 4 Å to 500 Å.
- 7. The composition of claim 6 wherein the porous titanosilicate is selected from TS-1, TS-2, Ti-beta, Ti-ZSM-12, Ti-ZSM-48, or Ti-MCM-41.
- 8. The composition of claim 1 wherein the composition is essentially free of a Group 8 metal.
- 9. The composition of claim 1 wherein the concentration of the promoter element ranges from about 0.01 to about 40 weight percent, based on the total weight of the catalyst composition.
- 10. A process of regenerating a deactivated catalyst composition comprising titanium, silver, and optionally, a promoter metal, the process comprising heating the deactivated catalyst at a temperature between 150° C. and 500° C. in the presence of a regeneration gas comprising oxygen, water, or a mixture of oxygen and water, the regeneration gas further optionally containing an inert gas, under regeneration conditions sufficient to regenerate, at least in part, the deactivated catalyst.
- 11. The process of claim 10 wherein the concentration of oxygen in the regeneration gas ranges from 2 to 100 mole percent, and/or the concentration of water in the regeneration gas ranges from 0.01 to 100 mole percent.
Priority Claims (3)
Number |
Date |
Country |
Kind |
PCT/US97/11414 |
Jun 1997 |
WO |
|
PCT/US97/11415 |
Jun 1997 |
WO |
|
PCT/US97/11417 |
Jun 1997 |
WO |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a divisional of U.S. patent application Ser. No. 10/079,112, filed on Feb. 19, 2002, now U.S. Pat. No. 6,562,986, which is a continuation of U.S. patent application Ser. No. 09/943,680, filed on Aug. 30, 2001, now abandoned, which is a divisional of U.S. patent application Ser. No. 09/458,136, filed on Dec. 9, 1999, now granted as U.S. Pat. No. 6,323,351, which is a continuation of International Patent Application No. PCT/US97/24270, filed Dec. 18, 1997, which claims the benefit of International Patent Application PCT/US 97/11414, filed Jun. 30, 1997; the benefit of International Patent Application PCT/US 97/11417, filed Jun. 30, 1997; and the benefit of International Patent Application PCT/US 97/11415, filed Jun. 30, 1997.
Government Interests
This invention was made with United States Government support under Award Number 70NANB5H1143 awarded by the National Institute of Standards and Technology. The United States Government has certain rights in the invention.
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Continuations (2)
|
Number |
Date |
Country |
Parent |
09/943680 |
Aug 2001 |
US |
Child |
10/079112 |
|
US |
Parent |
PCT/US97/24270 |
Dec 1997 |
US |
Child |
09/458136 |
|
US |