Process for dispersing or redispersing a Group VIII noble metal species on a porous inorganic support
US4952543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Dec 9, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J38/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for dispersing or dispersing relatively large crystallites of an agglomerated Group VIII noble metal species present on a porous inorganic support is disclosed. The process includes contacting the agglomerated noble metal species, e.g., palladium or platinum, present on the support, e.g., alumina, silica or a zeolite such as ZSM-5 from which at least a major portion of any extraneous matter such as coke or other residue has previously been removed, with nitric oxide (NO) alone or in admixture with a source of halogen such as Cl.sub.2 and thereafter removing sorbed nitrogen oxide(s) and halogen, if present. The thus treated metal-loaded catalyst demonstrates substantially increased benzene hydrogenation activity (BHA) compared to the same catalyst prior to treatment indicating significant dispersion/redispersion of the metal crystallites as smaller crystallites.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.