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Nano-structure of Carbons Deposited from CH4 Blowing to and Injecting into Molten Slag

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ISIJ Int. 52(8)_ 1404-1408 (2012).pdf1.22 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/75678

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)

Submitter: 柏谷 悦章

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