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Nano-structure of Carbons Deposited from CH4 Blowing to and Injecting into Molten Slag
Title: | Nano-structure of Carbons Deposited from CH4 Blowing to and Injecting into Molten Slag |
Authors: | Kashiwaya, Yoshiaki Browse this author →KAKEN DB | Watanabe, Masami Browse this author |
Keywords: | onion carbon | hard carbon film | decomposition of CH4 | molten slag |
Issue Date: | Aug-2012 |
Publisher: | Iron and Steel Institute of Japan |
Journal Title: | ISIJ International |
Volume: | 52 |
Issue: | 8 |
Start Page: | 1404 |
End Page: | 1408 |
Publisher DOI: | 10.2355/isijinternational.52.1404 |
Abstract: | How to produce the green hydrogen is important problem for reducing the CO2 emission. Among many processes on the production of hydrogen, a thermal decomposition reaction of CH4 can produce the pure hydrogen without CO and CO2 gases. When the reaction proceeds by using a waste heat, the obtained hydrogen will be approached to the green hydrogen. The thermal decomposition reaction of CH4 is mainly studied kinetically from several decades ago. CH4(g) = C(s)+ 2H2(g) However, the decomposition reaction on the surface of molten slag was not studied. Authors have studied the kinetics of decomposition reaction of CH4 on the surface of the molten slag in the previous study. The rate constant at 1700 K for the surface of the molten slag was about four times larger than that of graphite surface. In addition to the kinetics of the reaction, the carbon properties precipitated are quite interesting, because the structures of carbon are changed by the conditions such as the temperature and kind of solid/liquid surface which provided the reaction sites. In this study, it was found that two kinds of carbon were precipitated during the decomposition of CH4, when a molten slag existed in the system. The micro- and nano-structures of carbons precipitated were examined using SEM and TEM. The onion type carbon sphere were clarified, which were formed in the gas phase, furthermore, the high oriented graphite film was formed on the surface of molten slag. |
Rights: | 著作権は日本鉄鋼協会にある |
Type: | article |
URI: | http://hdl.handle.net/2115/75678 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 柏谷 悦章
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