Developments in SO{sub 3} decomposition for nuclear hydrogen production
Conference
·
OSTI ID:20979633
- Atomic Energy of Canada Limited - AECL, Chalk River Laboratories, Chalk River, Ontario K0J 1J0 (Canada)
The Sulphur-Iodine (S-I) Cycle is considered to be one of the best thermochemical hydrogen production processes currently under development in many countries. While the Very High Temperature Reactors (VHTRs) are capable of satisfying the high temperature requirements of all the steps of this process, Canada's Supercritical Water Reactor (SCWR) can satisfy the temperature requirements of all but the catalytic SO{sub 3} decomposition step. However, AECL's direct electrically heated catalytic structures may be used for the decomposition with only a marginal lowering of the overall efficiency of the S-I process. An externally heated reactor system with a 25-mm diameter by 100-mm long section for catalyst loading has been set-up and a few blank tests (without any catalyst) have been conducted. Pt-TiO{sub 2} and Fe{sub 2}O{sub 3} catalysts on ceramic rings were tested to provide base-case results for comparison with catalysts to be tested with electro-resistive heating. The H{sub 2}SO{sub 4} thermal decomposition was carried out at around 475 deg. C and SO{sub 3} decomposition rates were determined over the range of 500 to 900 deg. C. While both catalysts were very active for the decomposition reaction at the higher end of the range, the Pt-TiO{sub 2} catalyst was active even at the 500 deg. C region with the Fe{sub 2}O{sub 3} catalyst being active only above 600 deg. C. (authors)
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 20979633
- Country of Publication:
- United States
- Language:
- English
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