Method for selective internal platinization of porous aluminosilicates
US4912072A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Oct 21, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J29/068
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention involves processes for producing zeolite catalyst with an exclusively internal surface platinum coating. In one embodiment, the process of the present invention comprises initially equilibrating zeolite (preferably in powder form) with an organic solution (e.g., dichloromethane) of a neutral organo-platinum compound preferably platinum acetylacetonate. The equilibrated zeolite is then washed to remove externally associated organo-platinum compound. In the preferred procedure here, the solvent is then removed from the washed zeolite. Next, organo-platinum compound contained in the washed zeolite is decomposed, preferably by heating to between about 200.degree. C. and about 300.degree. C. Finally, internally-contained decomposed organo-platinum compound is reduced, preferably by hydrogenolysis, to produce zeolite with an exclusively internal surface platinum coating. Another process for producing internally platinized zeolite catalyst is also part of the present invention. This process comprises initially incubating an aqueous mixture comprising a cationic platinum complex and zeolite powder. A preferred cationic platinum complex is cis-diaquodiammine platinum, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.