Abstract
Hydrogen production by the sulfur-iodine (SI) process, with an electrodialysis (ED) stack embedded in the HI decomposition section (SEC3) to concentrate HI in the HIx solution and overcome the pseudo-azeotrope, was conducted under pressurized conditions. The HIx solution of H2O/HI = 5.63-6.13 and I2/HI = 0.57-1.97 was supplied to the SEC3. HI gas was concentrated in a packed distillation column and decomposed over Pt/Al2O3. The experimental results of distillation column operation under different feed rates and HIx compositions are reported. The raffinate from the column showed a pseudo-azeotropic HIx mixture, as predicted in previous research. The dynamic responses of the ED stack were examined during the start-up period according to the HIx feed composition at the anode inlet. The ED voltage changed with the I2 concentration in the inlet flow. The proton transport number (t+) and electro-osmosis coefficient (β) were estimated for the ED stack during the operations. Hydrogen production ranged from 18.3 to 50 L/h, depending on the operating conditions and HIx feed composition.
Original language | English |
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Pages (from-to) | 4560-4569 |
Number of pages | 10 |
Journal | International Journal of Hydrogen Energy |
Volume | 41 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2016 Mar 2 |
Keywords
- Electrodialysis
- Nuclear hydrogen
- Sulfur-iodine process
- Thermochemical cycle
- Water splitting
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology