Oxidation of L-sorbose with molecular oxygen on platinum modified by metals, amines and phosphines
Mallat, T; Bronnimann, C; Baiker, A
| HERO ID | 4947868 |
|---|---|
| In Press | No |
| Year | 1997 |
| Title | Oxidation of L-sorbose with molecular oxygen on platinum modified by metals, amines and phosphines |
| Authors | Mallat, T; Bronnimann, C; Baiker, A |
| Journal | Journal of Molecular Catalysis A: Chemical |
| Volume | 117 |
| Issue | 1-3 |
| Page Numbers | 425-438 |
| Abstract | The oxidative dehydrogenation of L-sorbose to 2-keto-L-gulonic acid in aqueous medium is reviewed with special emphasis on the use of promoted platinum catalysts. The activity of alumina- or carbon-supported platinum can be increased by selective deposition of bismuth or lead onto the supported platinum particles, and by preadsorbed strongly basic tertiary and quaternary amines. Both methods have a negative influence on the selectivity, but the effect of supported N-bases is less detrimental. Aromatic and cycloaliphatic amines, some phosphines and aminophosphines improve the selectivity to 2-keto-L-gulonic acid. The amine and phosphine modifiers are used in very small amounts, less than 600 ppm related to sorbose. The best modifier is hexamethylenetetramine, which provides 99-95% selectivity up to 30% conversion. The efficiency of metal, amine and phosphine type promoters is compared. |
| Doi | 10.1016/S1381-1169(96)00292-0 |
| Wosid | WOS:A1997WN73600043 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | oxidation; L-sorbose; supported platinum; modification |