化学的酸化による触媒再生は,電気化学的二酸化炭素の長期的減少を可能にします
Tu N Nguyen1,2, Zhu Chen3, Ali Shayesteh Zeraati4
1Department of Chemical Engineering, Queen's University, Kingston K7L 3N6, ON, Canada.
Journal of the American Chemical Society
|July 7, 2022
まとめ
銅触媒の新しい再生戦略は,電気化学的CO2削減 (ECR) の安定性を大幅に高め,エチレンなどの有価なマルチカーボン製品の高い選択性を高密度でも維持できます.
科学分野:
- 電気化学
- キャタリシス
- 材料科学
背景:
- 電気化学 CO2 削減 (ECR) は,高い電流密度,製品の選択性,および安定性による産業関連性を目指しています.
- 銅 (Cu) 触媒は,特に高電流密度では,ECR下で分解し,構造変化のために多炭素 (C2+) 製品に対する選択性を失う.
研究 の 目的:
- ECR用のCu触媒の動作安定性を向上させるための触媒再生戦略を開発し実証する.
- C2+製品,特にエチレンについて,工業的に重要な条件下で持続的に高い選択性を達成する.
主な方法:
- 触媒再生の"オン"と"オフ"を交互に操作する電解法を実装した.
- 150 mA cm-2のCu触媒と1 A cm-2の3D Cuガス拡散電極を搭載したフローセルを使用した.
- 形態学的変化の最小化,Cu原子の酸化,塩の洗浄,およびカトライトの温度低下の影響を調査した.
主要な成果:
- 再生戦略は,エチレン選択性を200時間以上150mAcm-2で維持し,触媒の稼働期間を大幅に延長しました.
- 3D Cu電極でエチレンに対するECRは1 A cm-2で≥40%の選択性を達成し,36時間以上安定した.
- 以前は分解されたと考えられていた触媒から高いC2+選択性の回復が実証された.
結論:
- Cuベースの触媒は,性能の劣化を経験しても,高いC2+選択性を得るために再生することができます.
- "オン"/"オフ"の電解戦略は,特定の操作調整と組み合わせて,触媒の寿命と性能を効果的に延長します.
- この研究は,安定した選択的な電気化学 CO2 を有価な製品に変換するための実行可能な経路を示しています.
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