Process for regeneration of carbon-supported, rhenium-containing catalysts
US6225477A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J38/68
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a method of improving the catalytic performance of palladium or ruthenium, rhenium-on-carbon hydrogenation catalysts operating in aqueous media where loss of soluble rhenium may result in rapid catalytic failure. A rhenium-containing hydrogenation catalyst comprised of rhenium on a support material is regenerated by first treating the catalyst with aqueous perrhenic acid or potassium perrhenate followed by treating the catalyst under reducing conditions at elevated temperature and pressure. Treatment of the catalyst as described replenishes dispersed fresh finely divided rhenium which enhances the activity of the catalyst while at the same time allowing the operations to be carried out in situ in the hydrogenation reactor or in a side stream reactor with significant savings in reducing reactor down time and precious metal expenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.