Direct reforming of Methane–Ammonia mixed fuel on Ni–YSZ anode of solid oxide fuel cells
| Autor: | Motohiro Saito, Katsuyuki Teramoto, Hideo Yoshida, Masashi Kishimoto, Masashi Takemoto, Hiroshi Iwai, Tomohisa Kawaguchi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Energy Engineering and Power Technology 02 engineering and technology Solid oxide fuel cells 010402 general chemistry 01 natural sciences Methane Ni–YSZ anode Catalysis Steam reforming Ammonia chemistry.chemical_compound Packed bed Steam methane reforming Renewable Energy Sustainability and the Environment Exhaust gas 021001 nanoscience & nanotechnology Condensed Matter Physics Decomposition 0104 chemical sciences Anode Fuel Technology chemistry Chemical engineering Ammonia decomposition Mixed fuel 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45(15):8965-8974 |
| ISSN: | 0360-3199 |
| Popis: | To control the temperature distribution in the Ni–YSZ (yttria-stabilized zirconia) anode of solid oxide fuel cells (SOFCs) by efficiently utilizing the heat generated by electrochemical reactions, the supply of methane–ammonia mixed fuel is proposed. The reaction characteristics of reforming/decomposition of the mixed fuel on a Ni–YSZ catalyst are experimentally investigated. A mixture gas of methane, steam, ammonia, and balance argon is supplied to a packed bed catalyst placed in a quartz tube in an electric furnace. The crushed Ni–YSZ anode of SOFCs is used as the catalyst. The exhaust gas composition is analyzed by gas chromatography and the streamwise temperature distribution of the catalyst bed is measured by an infrared camera. It is found that ammonia decomposition preferentially proceeds and steam methane reforming becomes active after sufficient ammonia has been consumed. A low-temperature region is formed by steam methane reforming owing to its strongly endothermic nature. Its position moves downstream while its magnitude decreases as the ammonia concentration in the fuel increases. This shows that the local temperature distribution can be controlled by tuning the ratio of methane to ammonia in the mixed fuel. It is also found that, at a certain mixture ratio, the mixed fuel realizes a hydrogen production rate higher than that for only methane or ammonia. |
| Databáze: | OpenAIRE |
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