Koichi Eguchi1*, Atthapon Srifa1, Takeou Okanishi1, Hiroki Muroyama1, Toshiaki Matsui1, Masashi Kishimoto1, Motohiro Saito1, Hiroshi Iwai1, Hideo Yoshida1, Masaki Saito2, Takeshi Koide2, Hiroyuki Iwai2, Shinsuke Suzuki2, Yosuke Takahashi2, Toshitaka Horiuchi3, Hayahide Yamasaki3, Shohei Matsumoto4, Shuji Yumoto4, Hidehito Kubo4, Jun Kawahara5, Akihiro Okabe5, Yuki Kikkawa6, Takenori Isomura6
1 Kyoto University; 2 Noritake; 3 Nippon Shokubai; 4 Toyota Industries; 5 Mitsui Chemical; 6 Tokuyama, Japan
NH3 Fuel Conference, Los Angeles, September 19, 2016
Ammonia is a promising hydrogen carrier because of its high hydrogen density, low production cost, and ease in liquefaction and transport. Ammonia decomposes into nitrogen and hydrogen through a mildly endothermic process. The ammonia decomposition temperature is close to the operating conditions of solid oxide fuel cells (SOFCs). Therefore, the integration of these two devices is beneficial in terms of efficient heat and energy managements and will lead to the development of simplified generation systems.
We have investigated three types of ammonia-fueled SOFC systems. In one system, ammonia is directly supplied to the anode chamber. Ammonia decomposes into nitrogen and hydrogen over Ni-based cermet anode, and subsequently the generated hydrogen is electrochemically oxidized to produce steam and electron. The second system consists of ammonia cracker and SOFC. In this case, ammonia is catalytically decomposed through the ammonia cracker, and hydrogen produced is electrochemically oxidized on the anode. Nickel-based catalysts were applied for the ammonia cracker due to their relatively high activity for ammonia decomposition among base metals. The last one is the system combined with auto-thermal ammonia cracker, which will be suitable for the rapid start-up.
In this study, we introduce the development of ammonia-fueled SOFC systems. 200 W-class stacks as well as button-type cells were applied as SOFCs. The performances of the three systems were evaluated and compared with each other.
This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “energy carrier” (Funding agency: JST).
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OTHER NH3 FUEL CONFERENCE PAPERS
2015: Current progress in development of NH3-fueled solid-state fuel cell systems
2014: Research and development of NH3-fueled solid-state fuel cell systems
Council for Science, Technology and Innovation
What is the Cross-ministerial Strategic Innovation Promotion Program? [PDF]
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