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ID 114823
著者
Hayashi, Yasunori Tokushima University
Okitsu, Ikumi Tokushima University
Kato, Yuki Mitsubishi Chemical Corporation
Ninomiya, Wataru Mitsubishi Chemical Corporation
キーワード
methane
oxidative dehydrogenation
active oxygen
UV-LED
TiO2
WO3
Sm2O3
資料タイプ
学術雑誌論文
抄録
There are active oxygen species that contribute to oxidative coupling or the partial oxidation during the oxidative dehydrogenation of methane when using solid oxide catalysts, and those species have not been definitively identified. In the present study, we clarify which of the active oxygen species affect the oxidative dehydrogenation of methane by employing photo-catalysts such as TiO2 or WO3, which generate active oxygen from UV-LED irradiation conditions under an oxygen flow. These photo-catalysts were studied in combination with Sm2O3, which is a methane oxidation coupling catalyst. For this purpose, we constructed a reaction system that could directly irradiate UV-LED to a solid catalyst via a normal fixed-bed continuous-flow reactor operated at atmospheric pressure. Binary catalysts prepared from TiO2 or WO3 were either supported on or kneaded with Sm2O3 in the present study. UV-LED irradiation clearly improved the partial oxidation from methane to CO and/or slightly improved the oxidative coupling route from methane to ethylene when binary catalysts consisting of Sm2O3 and TiO2 are used, while negligible UV-LED effects were detected when using Sm2O3 and WO3. These results indicate that with UV-LED irradiation the active oxygen of O2− from TiO2 certainly contributes to the activation of methane during the oxidative dehydrogenation of methane when using Sm2O3, while the active oxygen of H2O2 from WO3 under the same conditions afforded only negligible effects on the activation of methane.
掲載誌名
Catalysts
ISSN
20734344
出版者
MDPI
10
5
開始ページ
559
発行日
2020-05-18
権利情報
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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出版社版DOI
出版社版URL
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言語
eng
著者版フラグ
出版社版
部局
理工学系