Thermochemical generation of hydrogen and oxygen from water
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsPaul R. Robinson, Carlos E. Bamberger
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Abstract
A thermochemical cyclic process for the production of hydrogen exploits the reaction between sodium manganate (NaMnO.sub.2) and titanium dioxide (TiO.sub.2) to form sodium titanate (Na.sub.2 TiO.sub.3), manganese (II) titanate (MnTiO.sub.3) and oxygen. The titanate mixture is treated with sodium hydroxide, in the presence of steam, to form sodium titanate, sodium manganate (III), water and hydrogen. The sodium titanate-manganate (III) mixture is treated with water to form sodium manganate (III), titanium dioxide and sodium hydroxide. Sodium manganate (III) and titanium dioxide are recycled following dissolution of sodium hydroxide in water.
Claims6
A cyclic thermochemical process for producing hydrogen comprising the steps of:
- (a) reacting sodium manganate (III) and titanium dioxide to yield sodium titanate, manganese (II) titanate and oxygen:
- (b) reacting sodium titanate and manganese (II) titanate formed in step (a) with sodium hydroxide, in the presence of steam to yield sodium titanate, sodium manganate (III), water and hydrogen;
- (c) treating sodium titanate and sodium manganate (III) formed in step (b) with excess water to yield sodium manganate (III), titanium dioxide and sodium hydroxide;
- (d) dissolving sodium hydroxide formed in step (c) in water and removing the thus-dissolved sodium hydroxide to yield a residue of sodium manganate (III) and titanium dioxide;
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- (e) recycling the residue of sodium manganate (III) and titanium dioxide to step (a).
Dependencies are inferred from the claim text.