Process for the production of oxygen at high temperature with materials of the manganese oxides type having a lamellar structure
The present invention relates to a process for separating oxygen at high temperature by means of a material comprising at least one compound according to the formula A x BO 2-δ. yH 2 O with a lamellar structure composed of sheets generated by the sequence of octahedra connected to one another by the edges, whereby A is at least one of the elements IA or IIA of the periodic classification of elements, B is at least one of the elements IIIB to IIB of the periodic classification of the elements, 0<x≦2, 0≦y≦2, and −0.4≦δ≦0.4.
1. A process for producing oxygen at high temperature with an oxygen separation material comprising at least one compound responding to the formula A x BO 2-δ yH 2 O having a lamellar structure composed of sheets generated by the sequence of octahedra connected to one another by the edges, whereby A is at least one of the elements IA or IIA of the periodic classification of element, B is at one of the elements IIIB to IIB of the periodic classification of the elements, wherein B includes Mn, 0<x≦2, 0≦y≦2, and −0.4≦δ≦0.4, wherein: the partial pressure of oxygen on the material is diminished or the temperature to which the material is subjected is augmented so it releases a portion of its network oxygen in the form of gas O 2 ; then said material is subjected to a higher partial pressure of oxygen or this temperature is diminished so it re-oxidizes.
2. A process according to claim 1 , characterized in that the formula of the compound A x BO 2-δ. yH 2 O is such that 0.2<x≦1 .
3. A process according to claim 1 , characterized in that the separation material has a specific surface comprised between 1 and 200 m 2 ·g −1 .
4. A process according to claim 1 , characterized in that the separation material is used in the form of a powder, beads, pellets.
5. A process according to claim 1 , characterized in that the separation material is used in the form of an extrudate.
6. A process according to claim 1 , wherein the separation material is used in the form of a membrane in order to produce oxygen continuously.
7. A process according to one of the previous claims wherein the temperature is comprised between 400° C. and 900° C.
8. A process according to claim 1 , characterized in that the separation material has a specific surface comprised between 2 and 100 m 2 ·g −1 .
9. A process according to claim 1 , characterized in that the separation material has a specific surface comprised between 20 and 80 m 2 ·g −1 .