Methods for separating oxygen from oxygen-containing gases
Patent 6165431 Issued on December 26, 2000. Estimated Expiration Date: April 6, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
423/219, Molecular oxygen or ozone component55/524, With coating, impregnant, or bonding agent95/54, Oxygen permeates barrier96/4, APPARATUS FOR SELECTIVE DIFFUSION OF GASES (E.G., SEMIPERMEABLE MEMBRANE, ETC.)502/4IN FORM OF A MEMBRANE
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:Ax A'x A"2-(x+x') By B'y B"2-(y+y') O5+z ;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 includeAx Srx' By Fey' Co2-(y+y') O5+z,wherex 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.
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April 6, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
