Supported platinum group metal catalysts with controlled metal penetration
US4405506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1981 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Apr 13, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A refractory inorganic oxide support is impregnated with a mixture of a platinum sulfito complex solution and a rhodium nitrate solution or with a mixture of a platinum sulfito complex solution, a rhodium nitrate solution, and a rhodium sulfito complex solution and the impregnated support is activated. The method produces a catalyst which has a maximum platinum concentration within 20 microns of the external surface of the support and at least about 70 percent of the total platinum located within 100 microns of the external surface of the support. The catalyst also has at least about 30 percent of the total rhodium located within 20 microns of the external surface of the support and at least about 40 percent of the total rhodium located at 20 to 100 microns from the external surface of the support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.