Process for the production of hydrogen
AssigneeSnamprogetti S.p.A.
InventorsDomenico Sanfilippo, Alberto Paggini, Valerio Piccoli, Roberta Miglio, Stefano Rossini
Life of this patent
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Abstract
Process for the production of hydrogen consisting in subjecting a solid to oxidation and treating, in a different zone, the oxidized form thus produced with a reducing stream, preferably a hydrocarbon.
Claims25
A process for the production of hydrogen consisting in subjecting a solid to oxidation and treating the oxidized form thus produced with a reducing stream, in a different zone.
The process for the production of hydrogen according to the previous claim characterized in that it comprises the following operations:
- a) Oxidation of a solid in a first reaction zone;
- b) Passage of the oxidized form of the solid to a reaction zone into which a reducing stream is fed, and its reaction with a hydrocarbon;
- c) Recovery of the reduced form of the solid and its feeding to the first reaction zone;
- d) Heat supply.
The process for the production of hydrogen according to the previous claim, wherein the heat supply is preferably effected during one of the two operations (b) and (c).
The process for the production of hydrogen according to the previous claim, characterized in that the solid, in the first reaction zone, is preferably reacted with H2O.
The process for the production of hydrogen according to the previous claim, characterized in that the solid, in the two different situations, is further characterized by different amounts of oxygen and enthalpy and is capable of cyclically and continuously passing from the reduced form to the oxidized form, and viceversa.
The process for the production of hydrogen according to the previous claim, wherein at least one redox element is present in the solid as binary compound corresponding to the formula
- MexOy (7)
- wherein Me is selected from Ce, Fe, W, Ni;
- or as compounds corresponding to the formula
- MexZzOy (8)
- wherein Me is one or more elements selected from:
- Ce, Pr, Co, Ni, Fe, Mo and W,
- Z is one or more elements selected from Ce, Zr, V and Mo;
- X≧1, y≧0 and z≧1.
The process for the production of hydrogen according to at least one of the claims from 9 to 12, wherein the solid also contains a metal as promoter selected from Pt, Pd, Au and Rh.
The process for the production of hydrogen according to at least one of the claims from 9 to 14, wherein the solid also contains a transition metal as promoter selected from Cr, Mn, Nb and V.
The process for the production of hydrogen according to the previous claim, wherein the heat supply is obtained using hydrogen as fuel.
Dependencies are inferred from the claim text.