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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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/La2O3support 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-1g-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-La2O3nanofractions 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.

Original languageEnglish
Pages (from-to)24452-24460
Number of pages9
JournalACS Omega
Volume7
Issue number28
DOIs
Publication statusPublished - Jul 19 2022

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering

Fingerprint

Dive into the research topics of 'Co Nanoparticle Catalysts Encapsulated by BaO-La2O3Nanofractions for Efficient Ammonia Synthesis Under Mild Reaction Conditions'. Together they form a unique fingerprint.

Cite this