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US 4,230,682 AGranted
Cyclic thermochemical process for producing hydrogen using cerium-titanium compounds
AssigneeThe United States of America as represented by the United States Department of Energy
InventorCarlos E. Bamberger
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Abstract
A thermochemical cyclic process for producing hydrogen employs the reaction between ceric oxide and titanium dioxide to form cerium titanate and oxygen. The titanate is treated with an alkali metal hydroxide to give hydrogen, ceric oxide, an alkali metal titanate and water. Alkali metal titanate and water are boiled to give titanium dioxide which, along with ceric oxide, is recycled.
Claims8
A cyclic process for splitting water into hydrogen and oxygen, comprising the steps of:
- (1) reacting ceric oxide and titanium dioxide to form cerium titanate and oxygen, and separating thus-formed oxygen from the reaction environment;
- (2) reacting cerium titanate formed in step (1) with an alkali metal hydroxide, to form ceric oxide, an alkali metal titanate, water and hydrogen, and recovering the thus-formed hydrogen;
- (3) reacting ceric oxide and the alkali metal titanate formed in step (2) with water to yield ceric oxide, alkali metal hydroxide and titanium dioxide;
- (4) recycling thus-produced ceric oxide and titanium dioxide to step (1);
- and
- (5) recycling thus-produced alkali metal hydroxide to step (2).
3 more elements
Dependencies are inferred from the claim text.