単原子合金触媒によるCO中毒対策
Jilei Liu1, Felicia R Lucci2, Ming Yang1
1Department of Chemical and Biological Engineering, Tufts University , 4 Colby Street, Medford, Massachusetts 02155, United States.
Journal of the American Chemical Society
|May 12, 2016
まとめ
単原子合金 (SAA) のプラチナ触媒は,CO結合を弱めることで,一酸化炭素 (CO) 毒への耐性を高めています. 水素化や燃料電池などの 重要な産業反応の触媒性能を維持しています
科学分野:
- 材料科学
- カタリシス
- 表面化学
背景:
- プラチナ (Pt) 触媒は産業や燃料電池において不可欠であるが,一酸化炭素 (CO) の吸収によって無効化される.
- Pt表面への強いCO結合は,触媒の安定性と長寿の主要な制限です.
研究 の 目的:
- 触媒活性を維持しながら,CO結合強度が低下したプラチナベースの触媒を開発する.
- プラチナ触媒のCO耐性を高めるための単原子合金 (SAA) 戦略を調査する.
主な方法:
- 異なるプラチナ組のCO結合強度を定量化するために,表面感受性研究を使用した.
- 調製されたプラチナ・銅 (PtCu) 合金ナノ粒子 (NP)
- CO 曝露下で触媒の性能を評価するための探査反応としてアセチレン水素化を使用しています.
主要な成果:
- 1:125のPtCu SAAでは,CO結合が著しく減少することが示された.
- SAA触媒は,水素化と電酸化に不可欠なH2活性化中に優れたCO耐性を示した.
- アセチレンからエチネへの選択的水素化は,SAA NP上のCOの存在で活動喪失なしに進行した.
結論:
- SAA戦略は,CO吸収を弱めることでプラチナ触媒のCO中毒を効果的に軽減します.
- PtCu SAA触媒は,燃料電池と工業用水素化を含む高CO耐性を要求するアプリケーションに有望なソリューションを提供します.
- このアプローチは,CO阻害に敏感な様々な化学プロセスにおける触媒の安定性を高めるための広範な意味を持つ.
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