Catalytic Dehydrogenation of Ethane over Doped Perovskite via the Mars-van Krevelen Mechanism

Kenta Toko, Kazuharu Ito, Hikaru Saito, Yukiko Hosono, Kota Murakami, Satoshi Misaki, Takuma Higo, Shuhei Ogo, Hideaki Tsuneki, Shun Maeda, Kunihide Hashimoto, Hiromi Nakai, Yasushi Sekine

研究成果: Article

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For effective utilization of ethane in natural gas, catalytic dehydrogenation of ethane is a promising option that offers better efficiency than ethane cracking to produce ethylene, the most important fundamental chemical. Recently, it was reported that catalytic dehydrogenation of ethane proceeds effectively on doped perovskite oxide via the Mars-van Krevelen (MvK) mechanism. For this work, the reaction mechanism was investigated using density functional theory calculations. Results demonstrated that ethane activation over perovskite (La1-xBaxMnO3-δ) proceeds at the surface lattice oxygen coordinated with Ba, resulting in a low energy barrier of the C-H bond activation. Based on Bader charge analysis, the electron-deficient surface lattice oxygen, which is favorable for hydrogen abstraction from light alkanes, forms around Ba. In addition, the electronic charges of the surface lattice oxygen are important for H2 desorption. The electronic charge depends on hydrogen coverage: electron-rich surface lattice oxygen, which is favorable for H2 desorption, forms at high hydrogen coverage. Therefore, a part of the surface lattice oxygens of perovskite would be covered with hydrogen atoms under the reaction atmosphere, leading to effective H2 desorption and the proceeding catalytic cycle via the MvK mechanism.

元の言語English
ページ(範囲)10462-10469
ページ数8
ジャーナルJournal of Physical Chemistry C
124
発行部数19
DOI
出版物ステータスPublished - 2020 5 14

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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