Method for producing a preferential oxidation catalyst
US6673742B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jun 12, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B2203/047
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This is a hydrogen generation process for use with fuel cells which includes a preferential oxidation step to reduce the concentration of carbon monoxide. The preferential oxidation step includes contacting a fuel stream comprising hydrogen and carbon monoxide in the presence of an oxygen at a preferential oxidation temperature of between about 70° and about 160° C. with preferential oxidation catalyst for reducing the concentration of carbon monoxide to produce a treated fuel gas stream comprising less than about 50 ppm-vol carbon monoxide. The preferential oxidation catalyst comprises ruthenium metal dispersed on a shaped alumina carrier, wherein at least 60 percent of the ruthenium metal is present in a band extending from the surface towards the center and having a width of about 50 percent of the distance from the surface to the center of the shaped alumina carrier. Superior performance at low preferential oxidation temperatures below 130° C. was observed when the band comprised 50 percent of the alumina carrier and contained at least 60 percent of the ruthenium metal. The preferential oxidation catalyst may be employed to reduce carbon monoxide in fuel gas streams…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.