Compositions capable of operating under high oxygen partial pres

Details Compositions capable of operating under high oxygen partial pres Compositions capable of operating under high oxygen partial pres

1996-02-29

1998-10-06

Caldarola, Glenn

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

502400, 502324, 95 54, 96 4, B01J 2332, B01J 2000, B01D 5202, B01D 5322

Patent

active

058175970

ABSTRACT:
The present invention presents a new class of multicomponent metallic oxides which are particularly suited toward use in fabricating component used in solid-state oxygen separation devices. The compositions of the present invention are represented by the formula Ln.sub.x A'.sub.x ' Co.sub.y Fe.sub.y' Cu.sub.y" O.sub.3-z wherein Ln is an element selected from the f block lanthanides as represented by the IUPAC periodic table of the elements, A' is selected from strontium or calcium, x>0, y>0, y'>0, x +x'=1, y +y'+y"=1, 0.ltoreq.y"<0.4 and z is a number which renders the composition of matter charge neutral. These compositions provide a favorable balance of oxygen permeance, resistance of degradation when employed in such devices under high oxygen partial pressures and possess coefficients of thermal expansion which are compatible with other materials used to fabricate such devices.

REFERENCES:
patent: 5240480 (1993-08-01), Thorogood et al.
patent: 5356728 (1994-10-01), Balachandran et al.
patent: 5534471 (1996-07-01), Carolan et al.
patent: 5569633 (1996-10-01), Carolan et al.
Yamazoe and coworkers (Mat. Res. Bull., vol. 23, pp. 51-58, 1988).
Teraoka and coworkers (Chem. lett. pp. 503-506 1988).
Kharton and coworkers (Inorganic Materials, vol. 30, No. 4, 1994, pp. 492-495).

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