Oxygen-carrier solid with sub-stoichiometric spinel for a chemical-looping redox process
AssigneesIfp Energies Nouvelles, Total Raffinage Chimie
InventorsArnold Lambert, Mathieu Michau
Life of this patent
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Abstract
The present invention relates to an oxygen carrier solid, to the preparation thereof and to the use thereof in a chemical looping redox process such as chemical looping combustion (CLC). The solid in particulate form includes a total copper content (X) ranging from 5% to 39% expressed as CuO by weight relative to the total weight of the solid in its oxidized form, and a ceramic matrix within which said copper is dispersed, the matrix including a first sub-stoichiometric spinel of formula MgaAlbO4, and/or a second sub-stoichiometric spinel of formula CucMgdAleO4. The carrier solid includes an amount Y of MgO as a weight percentage of the oxygen carrier solid of between 1% and 23%, and Y<−0.6342X+26.223.
Claims16
An oxygen carrier solid in particulate form for a chemical looping redox process such as chemical looping combustion, including:
- copper in a total content X of between 5% and 39% expressed as copper oxide by weight relative to the total weight of the oxygen carrier solid in its oxidized form;
- a ceramic matrix within which said copper is dispersed, said ceramic matrix including:
- a first sub-stoichiometric spinel of formula MgaAlbO4, and
- a second sub-stoichiometric spinel of formula CucMgdAleO4,
- with:
- a
- =
- 4
- (
- 1
- +
- (
- 3
- ×
- (
- (
- 100
- -
- X
- )
- Y
- -
- 1
- )
- ×
- M
- MgO
- M
- Al
- 2
-
- O
- 3
- )
- )
- b
- =
- 8
- ×
- (
- 1
-
- 0
-
- 0
- -
- X
- -
- Y
- )
- (
- Y
- ×
- M
- Al
- 2
-
- O
- 3
- M
- M
-
- g
-
- O
- +
- 3
- ×
- (
- 1
-
- 0
-
- 0
- -
- X
- -
- Y
- )
- )
- c
- =
- 4
-
- X
- M
- CuO
- ×
- (
- X
- M
- CuO
- +
- Y
- M
- MgO
- +
- 3
- ×
- 1
-
- 0
-
- 0
- -
- X
- -
- Y
- M
- Al
- 2
-
- O
- 3
- )
- d
- =
- 4
-
- Y
- M
- MgO
- *
- (
- X
- M
- CuO
- +
- Y
- M
- MgO
- +
- 3
- ×
- 1
-
- 0
-
- 0
- -
- X
- -
- y
- M
- Al
- 2
-
- O
- 3
- )
- e
- =
- 8
- ×
- (
- 1
-
- 0
-
- 0
- -
- X
- -
- Y
- )
- M
- Al
- 2
-
- O
- 3
- ×
- (
- X
- M
- CuO
- +
- Y
- M
- MgO
- +
- 3
- ×
- 1
-
- 0
-
- 0
- -
- X
- -
- Y
- M
- Al
- 2
-
- O
- 3
- )
- MMgO, MCuO and MAl2O3 being the molar masses of MgO, CuO and Al2O3, respectively, Y being the amount of MgO as a weight percentage of the oxygen carrier solid, with X being between 5% and 39%, Y being between 1% and 23%, and Y<−0.6342X+26.223,
- wherein the matrix comprises more than 95% by weight of the second spinel.
Dependencies are inferred from the claim text.