Thermochemical cyclic system for decomposing H2O and/or CO2 by means of cerium-titanium-sodium-oxygen compounds
A thermochemical closed cyclic process for the decomposition of water and/or carbon dioxide to hydrogen and/or carbon monoxide begins with the reaction of ceric oxide (CeO2), titanium dioxide (TiO2) and sodium titanate (Na2TiO3) to form sodium cerous titanate (NaCeTi2O6) and oxygen. Sodium cerous titanate (NaCeTi2O6) reacted with sodium carbonate (Na2CO3) in the presence of steam, produces hydrogen. The same reaction, in the absence of steam, produces carbon monoxide. The products, ceric oxide and sodium titanate, obtained in either case, are treated with carbon dioxide and water to produce ceric oxide, titanium dioxide, sodium titanate, and sodium bicarbonate. After dissolving sodium bicarbonate from the mixture in water, the remaining insoluble compounds are used as starting materials for a subsequent cycle. The sodium bicarbonate can be converted to sodium carbonate by heating and returned to the cycle.
- Assignee:
- Dept. Of Energy
- Patent Number(s):
- US 4313925
- OSTI ID:
- 5375212
- Country of Publication:
- United States
- Language:
- English
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Thermochemical cyclic system for decomposing H/sub 2/O and/or CO/sub 2/ by means of cerium-titanium-sodium-oxygen compounds
Thermochemical cyclic system for splitting water and/or carbon dioxide by means of cerium compounds and reactions useful therein
Related Subjects
080102* -- Hydrogen-- Production-- Thermochemical Processes
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CERIUM
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
METALS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RARE EARTHS
RECYCLING
SODIUM COMPOUNDS
THERMOCHEMICAL PROCESSES
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
WATER