Co Nanoparticle Catalysts Encapsulated by BaO-La2O3Nanofractions for Efficient Ammonia Synthesis under Mild Reaction Conditions

Shin Ichiro Miyahara, Katsutoshi Sato, Kotoko Tsujimaru, Yuichiro Wada, Yuta Ogura, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Koji Inazu, Katsutoshi Nagaoka

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Ruthenium catalysts may allow for realization of renewable energy-based ammonia synthesis processes using mild reaction conditions (<400 °C, <10 MPa). However, ruthenium is relatively rare and therefore expensive. Here, we report a Co nanoparticle catalyst loaded on a basic Ba/La2O3 support and prereduced at 700 °C (Co/Ba/La2O3_700red) that showed higher ammonia synthesis activity at 350 °C and 1.0-3.0 MPa than two benchmark Ru catalysts, Cs+/Ru/MgO and Ru/CeO2. The synthesis rate of the catalyst at 350 °C and 1.0 MPa (19.3 mmol h-1 g-1) was 8.0 times that of Co/Ba/La2O3_500red and 6.9 times that of Co/La2O3_700red. The catalyst showed ammonia synthesis activity at temperatures down to 200 °C. Reduction at the high temperature induced the formation of BaO-La2O3 nanofractions around the Co nanoparticles by decomposition of BaCO3, which increased turnover frequency, inhibited the sintering of Co nanoparticles, and suppressed ammonia poisoning. These strategies may also be applicable to other non-noble metal catalysts, such as nickel.

本文言語英語
ジャーナルACS Omega
DOI
出版ステータス印刷中 - 2022

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)

フィンガープリント

「Co Nanoparticle Catalysts Encapsulated by BaO-La2O3Nanofractions for Efficient Ammonia Synthesis under Mild Reaction Conditions」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル