Metal oxide catalytic compositions having perovskite crystal structures and containing metals of the platinum group
US4049583A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | May 24, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/525
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Metal oxides of the type [A.sup.1.sub.1-x A.sup.2.sub.x ]B'.sub.1-y Me.sub.y ]O.sub.3 having perovskite-type crystal structures in which PA1 A.sup.1 and A.sup.2 are each one or more mono-, di-, or trivalent metals having ionic radii between about 0.8 and 1.65 Angstroms; PA1 B' is one or more metals having ionic radii between about 0.4 and 1.4 Angstroms; PA1 Me is one or more metals of the platinum group (ruthenium, osmium, rhodium, iridium, palladium, and platinum); PA1 x is between about 0.01 and 0.99; and PA1 y is between about 0.01 and 0.20 Are useful as catalysts for the oxidation of hydrocarbons and carbon monoxide and for the reduction of nitrogen oxides under conditions typical of those involved in the cleanup of the exhaust gases of internal combustion engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.