Patent ID: 8642005

Claim:
A method for producing hydrogen via a thermochemical route from water, based on the cerium-chlorine cycle, wherein, according to a first reaction scheme, conducting the following reactions: H 2 O+Cl 2 =2HCl+½O 2 ; (A) 8HCl+2CeO 2 =2CeCl 3 +Cl 2 +4H 2 O; (B) 2CeCl 3 +4H 2 O=2CeO 2 +6HCl+H 2 ; (C) or wherein, according to a second reaction scheme, conducting the following reactions: H 2 O+Cl 2 =2HCl+½O 2 ; (A) 8HCl+2CeO 2 =2CeCl 3 +Cl 2 +4H 2 O; (B) 2CeCl 3 +2H 2 O=2CeOCl+4HCl; (B′) 2CeOCl+2H 2 O=2CeO 2 +2HCl+H 2 ; (C′) wherein the reaction (B) for hydrochlorination of cerium oxide is conducted in a liquid phase, the cerium chloride passing into solution; and wherein the reaction (B) is catalyzed by fluoride ions.