Methods for separating oxygen from oxygen-containing gases
US6165431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Apr 6, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention provides mixed conducting metal oxides particularly useful for the manufacture of catalytic membranes for gas-phase oxygen separation processes. The materials of this invention have the general formula: EQU A.sub.x A'.sub.x A".sub.2-(x+x') B.sub.y B'.sub.y B".sub.2-(y+y') O.sub.5+z ; where PA1 x and x' are greater than 0; PA1 y and y' are greater than 0; PA1 x+x' is less than or equal to 2; PA1 y+y' is less than or equal to 2; PA1 z is a number that makes the metal oxide charge neutral; PA1 A is an element selected from the f block lanthanide elements; A' is an element selected from Be, Mg, Ca, Sr, Ba and Ra; PA1 A" is an element selected from the f block lanthanides or Be, Mg, Ca, Sr, Ba and Ra; B is an element selected from the group consisting of Al, Ga, In or mixtures thereof; and PA1 B' and B" are different elements and are independently selected from the group of elements Mg or the d-block transition elements. The invention also provides methods for oxygen separation and oxygen enrichment of oxygen deficient gases which employ mixed conducting metal oxides of the above formula. Examples of the materials used for the preparation of the membrane include EQU A.sub…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.