Thermochemical cyclic system for decomposing H.sub.2 O and/or CO.sub.2 by means of cerium-titanium-sodium-oxygen compounds
- Oak Ridge, TN
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 (CeO.sub.2), titanium dioxide (TiO.sub.2) and sodium titanate (Na.sub.2 TiO.sub.3) to form sodium cerous titanate (NaCeTi.sub.2 O.sub.6) and oxygen. Sodium cerous titanate (NaCeTi.sub.2 O.sub.6) reacted with sodium carbonate (Na.sub.2 CO.sub.3) 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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4313925
- OSTI ID:
- 864124
- Country of Publication:
- United States
- Language:
- English
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cyclic
decomposing
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cerium-titanium-sodium-oxygen
compounds
closed
process
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water
carbon
dioxide
hydrogen
monoxide
begins
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ceric
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ceo
titanium
sodium
titanate
na
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cerous
naceti
oxygen
reacted
carbonate
presence
steam
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absence
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remaining
insoluble
starting
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subsequent
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thermochemical cyclic
sodium bicarbonate
sodium titanate
ceric oxide
starting material
sodium carbonate
carbon dioxide
carbon monoxide
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titanium dioxide
cyclic process
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produces hydrogen
closed cyclic
thermochemical closed
oxygen compounds
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