Kamatani Kohei, Higuchi Kimitaka, Yamamoto Yuta, Arai Shigeo, Tanaka Nobuo, Ogura Masaru
Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan.
Ecotopia Science Institute and Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
Sci Rep. 2015 Jul 8;5:10161. doi: 10.1038/srep10161.
The ability to observe chemical reactions at the molecular level convincingly demonstrates the physical and chemical phenomena occurring throughout a reaction mechanism. Videos obtained through in situ transmission electron microscopy (TEM) revealed the oxidation of catalytic soot under practical reaction conditions. Carbon oxidation reactions using Ag/SiO2 or Cs2CO3/nepheline catalysts were performed at 330 °C under an O2 flow of 0.5 Pa in the TEM measurement chamber. Ag/SiO2 catalyzed the reaction at the interface of the mobile Ag species and carbon, while the Cs species was fixed on the nepheline surface during the reaction. In the latter case, carbon particles moved, remained attached to the Cs2CO3/nepheline surface, and were consumed at the interface by the oxidation reaction. Using this technique, we were able to visualize such mobile and immobile catalysis according to different mechanisms.
在分子水平观察化学反应的能力令人信服地证明了整个反应机理中发生的物理和化学现象。通过原位透射电子显微镜（TEM）获得的视频揭示了实际反应条件下催化烟灰的氧化过程。在TEM测量室中，使用Ag/SiO₂或Cs₂CO₃/霞石催化剂在330°C、0.5 Pa的O₂气流下进行碳氧化反应。Ag/SiO₂在移动的Ag物种与碳的界面处催化反应，而Cs物种在反应过程中固定在霞石表面。在后一种情况下，碳颗粒移动，附着在Cs₂CO₃/霞石表面，并在界面处通过氧化反应被消耗。使用这项技术，我们能够根据不同的机理可视化这种移动和固定催化过程。
