Recent research on themochemical hydrogen production at the Oak Ridge National Laboratory. [Co/Co(Ba) and Cu/Cu(Ba,F) cycles]
Continuing efforts on the identification and determination of chemical feasibility of thermochemical cycles for the production of hydrogen from water have recently resulted in two new cycles. The reactions involved have been demonstrated experimentally. One cycle consists of essentially three reactions: (1) the oxidation of Co(II), as CoO, by barium hydroxide to a compound containing barium and Co(II,IV) while evolving hydrogen, (2) the hydrolysis of the compound to Ba(OH)/sub 2/, which is water soluble, and Co/sub 3/O/sub 4/, and (3) the thermal decomposition of Co/sub 3/O/sub 4/ to CoO and oxygen. At least two new barium-cobalt compounds can be produced by reaction (1) depending on the initial Ba/Co ratios; however, on hydrolysis they yield the same products. This cycle appears to be quite simple and can be effected at reasonable temperatures. The second cycle involves essentially five chemical reactions. The first reaction is new and consists of the oxidation of metallic copper by barium hydroxide to a double oxide of copper(I) and barium while evolving hydrogen. Reaction 2 consists of the hydrolysis of the double oxide into barium hydroxide and copper(I) oxide. Copper(I) oxide is then reacted with aqueous HF to yield copper(II) fluoride and metallic copper. The fourth reaction involves the pyrohydrolysis of copper fluoride to copper(II) oxide. The cycle is closed with the thermal decomposition of copper(II) oxide. Although this cycle comprises five chemical reactions, they are quite simple and do not involve difficult separation procedures. The fluorine compounds are involved only in reactions that proceed at relatively low temperatures and thus do not appear to pose intractable corrosion problems. Experimental data on the above reactions and structural data on some of the new compounds are presented.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6639016
- Report Number(s):
- CONF-780807-10
- Resource Relation:
- Conference: 2. world hydrogen energy conference, Zurich, Switzerland, 21 Aug 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN PRODUCTION
THERMOCHEMICAL PROCESSES
OXYGEN
PRODUCTION
BARIUM HYDROXIDES
COBALT OXIDES
COPPER
WATER
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COBALT COMPOUNDS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN COMPOUNDS
HYDROXIDES
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
080102* - Hydrogen- Production- Thermochemical Processes