Highly selective shell impregnated catalyst of improved space time yield for production of vinyl acetate
US6794332B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J21/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A shell impregnated catalyst of Pd—Au produced on a silica support by impregnating the support with aqueous solutions of palladium and gold salts or acids and thereafter precipitating water insoluble compounds of Pd and Au on the support with alkali metal silicate or hydroxide fixing agents, then drying the support which has precipitated compounds of Pd and Au on its surface and reducing the surface precipitated compounds of Pd and Au until substantially all of the Pd and Au contents are reduced to a free metal state, after which the catalyst precursor is impregnated with potassium acetate and then dried. Improvements in the catalyst are realized by certain factors in process and composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.