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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EXPERIMENTAL STUDY ON DIRECT REFORMING REACTION OF AMMONIA-METHANE MIXED FUEL ON Ni-YSZ ANODE OF SOFCs

Get access (open in a dialog) DOI: 10.1615/IHTC16.ecl.023640
pages 4157-4164

Résumé

As a new option for wide operational flexibility of solid oxide fuel cells (SOFCs), we proposed ammonia addition to the methane fuel. Porous Ni-YSZ, which is a typical anode material, was chosen as the test catalyst in this study. A mixture gas of methane, steam, ammonia and balance argon was supplied to the packed-bed catalyst placed in a quartz tube at furnace temperatures ranging from 600 to 700 °C. The exhaust gas composition was analyzed by gas chromatography. It was found that when humidified methane was supplied to the catalyst without ammonia, the catalyst temperature significantly decreased owing to the strong endothermic nature of the steam methane reforming reaction. On the other hand, when ammonia was added to the humidified methane, ammonia decomposition proceeded preferentially compared to the steam methane reforming. Since heat absorption by ammonia decomposition reaction is much lower than that of steam methane reforming reaction, the position of the severe temperature drop by the steam methane reforming was shifted towards the downstream of the catalyst by adding ammonia to the supplied gas. The reaction preference of steam methane reforming and ammonia decomposition was associated with the local mole fraction of methane and ammonia