Process for the production of hydrogen by the thermochemical...

Details Process for the production of hydrogen by the thermochemical... Process for the production of hydrogen by the thermochemical...

2005-12-20

2010-02-09

King, Roy (Department: 1793)

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

C423S657000, C423S053000, C423S492000, C204S157800

Reexamination Certificate

active

07658904

ABSTRACT:
Process for the production of hydrogen by the thermochemical route from water, based on the chlorine/cerium cycle, in which, according to a first reaction scheme, the following reactions are carried out:in-line-formulae description="In-line Formulae" end="lead"?H2O+Cl2=2HCl+½O2;  (A)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2CeCl3+4H2O=2CeO2+6HCl+H2;  (C)in-line-formulae description="In-line Formulae" end="tail"?or in which, according to a second reaction scheme, the following reactions are carried out:in-line-formulae description="In-line Formulae" end="lead"?H2O+Cl2=2HCl+½O2;  (A)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?8HCl+2CeO2=2CeCl3+Cl2+4H2O;  (B)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2CeCl3+2H2O=2CeOCl+4HCl;  (B′)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2CeOCl+2H2O=2CeO2+2HCl+H2;  (C′)in-line-formulae description="In-line Formulae" end="tail"?and in which the reaction (B) for the chlorination of cerium oxide is carried out in the liquid phase, the cerium chloride passing into solution.

REFERENCES:
patent: 2002/0108404 (2002-08-01), Burke et al.
patent: 52021293 (1977-02-01), None
Jiro et al. “Rare earth elements. IX. Preparation of anhydrous rare earth chlorides”, Denki Kagaku (1964), 32(2), 109-16.
Bamberger et al., “Hydrogen production from water by thermochemical cycles,” Cryogenics, vol. 16, pp. 197-208 (Apr. 1976).
Bamberger, “Hydrogen production from water by thermochemical cycles; a 1977 update,” Cryogenics, vol. 18, pp. 170-183 (Mar. 1978), search report.
Onstott, “Thermosplitting of Hydrochloric Acid for Hydrogen Production with Cerium Dioxide as the Recycle Reagent,” J. Phys. Chem., vol. 98, No. 51, pp. 13541-13545 (1994), search report.
Onstott, “Cerium Dioxide as a Recycle Reagent for Thermochemical Hydrogen Production by Splitting Hydrochloric Acid Into the Elements,” Int. J. Hydrogen Energy, vol. 22, No. 4, pp. 405-408 (1997), search report.
Hollabaugh et al., “A Study of the Cerium-Chlorine System for Thermochemical Production of Hydrogen,” Proc. 2WHEC, vol. 2, pp. 809-828 (Aug. 1978).

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