Patent Number: 6,165,431

Title: Methods for separating oxygen from oxygen-containing gases

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:wherex and x' are greater than 0;y and y' are greater than 0;x+x' is less than or equal to 2;y+y' is less than or equal to 2;z is a number that makes the metal oxide charge neutral;A is an element selected from the f block lanthanide elements; A' is an element selected from Be, Mg, Ca, Sr, Ba and Ra;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; andB' 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 includewherex is about 0.3 to about 0.5,x' is about 1.5 to about 1.7,y is 0.6,y' is between about 1.0 and 1.4 andB is Ga or Al.

Inventors: Mackay; Richard (Lafayette, CO), Schwartz; Michael (Boulder, CO), Sammells; Anthony F. (Boulder, CO)

Assignee: Eltron Research, Inc.

International Classification: B01J 19/00 (20060101); B01J 35/06 (20060101); B01J 35/00 (20060101); C01C 3/00 (20060101); C01B 13/02 (20060101); C01B 17/00 (20060101); C01B 17/04 (20060101); H01M 8/12 (20060101); B01J 19/24 (20060101); B01J 4/04 (20060101); B01J 8/00 (20060101); B01D 53/32 (20060101); B01J 4/00 (20060101); B01D 53/22 (20060101); B01D 71/00 (20060101); B01J 23/00 (20060101); B01D 71/02 (20060101); B01J 23/83 (20060101); B01J 23/76 (20060101); B01J 12/00 (20060101); C01B 3/00 (20060101); C01B 3/38 (20060101); C01B 3/36 (20060101); C01C 3/02 (20060101); B01D 053/22 (); C01B 013/00 ()

Expiration Date: 12/26/2013