Direct epoxidation process using improved catalyst composition
View Patent ↗A process for producing an epoxide comprising reacting an olefin, hydrogen and oxygen in the presence of a catalyst comprising a titanium or vanadium zeolite, palladium, and lead. The process results in significantly reduced alkane by-product formed by the hydrogenation of olefin.
1. A process for producing an epoxide comprising reacting an olefin, hydrogen and oxygen in the presence of a catalyst comprising titanium or vanadium zeolite, palladium, and lead.
2. The process of claim 1 wherein the titanium or vanadium zeolite is titanium silicalite.
3. The process of claim 1 wherein the catalyst is comprised of from 0.01 to 10 weight percent palladium and from 0.001 to 2 weight percent lead.
4. The process of claim 1 wherein the olefin is a C 2 -C 6 olefin.
5. The process of claim 1 wherein the olefin is propylene.
6. The process of claim 1 wherein the reaction is performed in the presence of a solvent selected from the group consisting of alcohols, ethers, esters, ketones, water, liquid CO 2 , and mixtures thereof.
7. The process of claim 1 wherein the catalyst comprises palladium and lead supported on the titanium or vanadium zeolite.
8. The process of claim 7 wherein the catalyst comprises palladium, lead, and an additional noble metal supported on the titanium or vanadium zeolite.
9. The process of claim 8 wherein the noble metal is gold.
10. The process of claim 1 wherein the palladium and lead are supported on a carrier.
11. The process of claim 10 wherein the carrier is selected from the group consisting of carbons, titanias, zirconias, niobias, silicas, aluminas, silica-aluminas, tantalum oxides, molybdenum oxides, tungsten oxides, titania-silicas, zirconia-silicas, niobia-silicas, and mixtures thereof.
12. A process for producing propylene oxide comprising reacting propylene, hydrogen and oxygen in the presence of a titanium or vanadium zeolite and a supported catalyst comprising palladium, lead, and a carrier.
13. The process of claim 12 wherein the titanium or vanadium zeolite is a titanium silicalite.
14. The process of claim 12 wherein the supported catalyst is comprised of from 0.01 to 10 weight percent palladium and from 0.001 to 2 weight percent lead.
15. The process of claim 12 wherein the carrier is selected from the group consisting of carbons, titanias, zirconias, niobias, silicas, aluminas, silica-aluminas, tantalum oxides, molybdenum oxides, tungsten oxides, titania-silicas, zirconia-silicas, niobia-silicas, and mixtures thereof.
16. The process of claim 12 wherein the supported catalyst comprises palladium, lead, an additional noble metal, and a carrier.
17. The process of claim 16 wherein the noble metal is gold.
18. The process of claim 12 wherein the reaction is performed in the presence of a solvent selected from the group consisting of alcohols, ethers, esters, ketones, water, liquid CO 2 , and mixtures thereof.
19. The process of claim 18 wherein the reaction is performed in the presence of a buffer.