Thermochemical cyclic system for splitting water and/or carbon dioxide by means of cerium compounds and reactions useful therein
- Oak Ridge, TN
- Knoxville, TN
A thermochemical cyclic process for producing hydrogen from water comprises reacting ceric oxide with monobasic or dibasic alkali metal phosphate to yield a solid reaction product, oxygen and water. The solid reaction product, alkali metal carbonate or bicarbonate, and water, are reacted to yield hydrogen, ceric oxide, carbon dioxide and trialkali metal phosphate. Ceric oxide is recycled. Trialkali metal phosphate, carbon dioxide and water are reacted to yield monobasic or dibasic alkali metal phosphate and alkali metal bicarbonate, which are recycled. The cylic process can be modified for producing carbon monoxide from carbon dioxide by reacting the alkali metal cerous phosphate and alkali metal carbonate or bicarbonate in the absence of water to produce carbon monoxide, ceric oxide, carbon dioxide and trialkali metal phosphate. Carbon monoxide can be converted to hydrogen by the water gas shift reaction.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4237105
- OSTI ID:
- 863737
- Country of Publication:
- United States
- Language:
- English
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absence
alkali
alkali metal
basic alkali
bicarbonate
carbon
carbon dioxide
carbon monoxide
carbonate
ceric
ceric oxide
cerium
cerous
compounds
comprises
comprises reacting
converted
cyclic
cyclic process
cylic
dibasic
dioxide
gas
gas shift
hydrogen
means
metal
metal carbon
metal carbonate
metal phosphate
modified
monobasic
monoxide
oxide
oxygen
phosphate
process
produce
produce carbon
producing
producing carbon
producing hydrogen
product
reacted
reacting
reaction
reaction product
reactions
recycled
shift
shift reaction
solid
solid reaction
splitting
splitting water
therein
thermochemical
thermochemical cyclic
trialkali
useful
useful therein
water
water gas
yield