2016 Fiscal Year Annual Research Report
化学ループ法による水素生成・二酸化炭素分離システムの開発
| Project/Area Number |
16F16765
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| Research Institution | The University of Tokyo |
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Principal Investigator |
大友 順一郎 東京大学, 大学院新領域創成科学研究科, 准教授 (90322065)
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| Co-Investigator(Kenkyū-buntansha) |
KELLER MARTIN 東京大学, 大学院新領域創成科学研究科, 外国人特別研究員
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| Project Period (FY) |
2016-11-07 – 2018-03-31
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| Keywords | 低炭素社会 / 水素生成 / 二酸化炭素利用 / 化学ループ |
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| Outline of Annual Research Achievements |
A novel process configuration for carbon dioxide activation into carbon monoxide by methane in a dual-bed reactor configuration by circulating supported iron oxide/iron particles with deposited carbon between two reactors is developed. In reactor A (fuel reactor), iron oxide (magnetite) is reduced to metallic iron with hydrogen which is produced by catalytic cracking of methane fed to the bottom of the reactor. The reduced iron particles and the carbon deposited on them from methane cracking are then introduced to reactor B (carbon reactor), in which carbon dioxide is fed. There, the carbon is gasified by the reverse Boudouard reaction and the iron is reoxidized back to magnetite, thereby activating carbon dioxide into carbon monoxide. The concept is evaluated by thermodynamic equilibrium calculations, and suitable materials are developed. These materials need to provide favorable kinetics and good thermochemical and cyclic stability. Equilibrium and flowsheeting calculations were performed using the thermodynamic software “HSC Sim”, with positive results that indicate the high potential of this process for carbon dioxide activation. The development of suitable materials was initiated, and iron oxide cermets with Zr-based ceramic supports exhibited the most promising set of properties regarding cyclic stability and accelerated reaction kinetics.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The reduction kinetics with hydrogen, the kinetics for methane cracking and the reoxidation kinetics with carbon dioxide were evaluated by a thermogravimetric analysis in a redox cyclic manner. Iron oxide reduction kinetics were fastest with yttrium doped barium zirconate (BZY) and perovskite-type Sr-Fe-Ti-O metal oxide (SFT) as support materials. BZY support also exhibited favorable properties for methane cracking, while SFT proved support to be an ineffective support for methane cracking. Compared to the non-conductive barium zirconate support, the use of proton-conducting BZY resulted in a 60% increase in rate for the reduction reaction with hydrogen at 800°C, while the capacity for carbon uptake during the initial rapid methane cracking was approximately doubled. These results suggest that the current research is progressing in a good manner.
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| Strategy for Future Research Activity |
To investigate materials with high activities for hydrogen production, carbon dioxide reduction, and oxygen release, future research will be directed at identifying novel material compositions that further improve the performance of the process and that can be synthesized at lower cost. Materials will be further characterized in-depth by electron microscopy and other analytical techniques, and detailed kinetics with a thermogravimetric analysis and a real-time reaction product analysis will be established to gain insight into reaction mechanisms. Through the characterizations and the kinetic measurements, a strategy for the synthesis of new materials with high reaction activity and durability can be proposed.
Note: Since the relevant JSPS international special researcher came to Japan in the end of November 2016, the research period was very short in the last year and thus presentations in conferences and/or journal submissions have not been done yet. However, in 2017, such achievements (i.e., presentations in international/domestic conferences and journal submissions) will be done according to the research plan stated above.
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Research Products
(1 results)
