High Oxidation Tolerance of Ru Nanoparticles on 12CaO·7Al2O3 Electride

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• 作者：Hitoshi Abe ; Yasuhiro Niwa ; Masaaki Kitano ; Yasunori Inoue ; Youichi Murakami ; Toshiharu Yokoyama ; Michikazu Hara ; Hideo Hosono
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 28, 2016
• 年：2016
• 卷：120
• 期：16
• 页码：8711-8716
• 全文大小：346K
• 年卷期：0
• ISSN：1932-7455

文摘

A high tolerance to oxidation of Ru nanoparticles loaded on 12CaO·7Al₂O₃ (C12A7) was examined by in situ X-ray absorption fine structure (XAFS). Ru nanoparticles on electron-doped C12A7 (C12A7:e^–) and stoichiometric C12A7 (C12A7:O^2–) are robust to oxidation, while those on Al₂O₃ and on MgO with Cs promoters are easily oxidized. The oxidation tolerance is higher for Ru/C12A7:e^– than Ru/C12A7:O^2–. The main factor of the oxidation tolerance comes from the electron donation property of C12A7:e^–. C12A7:e^– is an electride in which electrons serve as anions, and these anionic electrons with a low work function (2.4 eV) have a high ability to donate electrons to supporting Ru nanoparticles with a higher work function (4.7 eV). Electron transfer from C12A7:e^– maintains Ru nanoparticles in the metallic state even under oxidation condition. The Ru catalysts on C12A7:e^– with high oxidation tolerance can be applied to various catalytic reactions under oxygen-rich conditions, in which conventional catalysts are rapidly oxidized.