アンモニア・ボラン水解による高度選択性および鋭い火山型シネージスティックNi2Pt@ZIF-8-触媒化水素の進化
Fangyu Fu1, Changlong Wang1,2, Qi Wang1
1ISM, UMR CNRS No. 5255 , Université de Bordeaux , 33405 Talence Cedex , France.
Journal of the American Chemical Society
|July 12, 2018
まとめ
高効率の水素 (H2) 生産は,ZIF-8によってサポートされる新しい二金属ニッケルプラチナ (Ni2Pt) ナノ粒子を使用して達成されます. この触媒は驚くべきシナジーを示し,H2生成の既存の方法よりも優れています.
科学分野:
- 材料科学
- カタリシス
- ナノテクノロジー
背景:
- アンモニア・ボランの水解は,安全で迅速な水素 (H2) 生産のための有望な経路を提供します.
- 効率的な触媒は,H2生成のためのアンモニア・ボランの潜在能力を解き放つために不可欠です.
研究 の 目的:
- アンモニア・ボランの水解のための高効率のバイメタリックナノ粒子触媒の開発と最適化.
- 亜硫酸イミダゾラート (ZIF-8) フレームワークにおけるニッケルとプラチナの相乗効果を調査する
主な方法:
- ほぼ単分散の合金バイメタリックNi-Ptナノ粒子の合成.
- ZIF-8のサポートにナノ粒子を固定する.
- NaOHを含む様々な条件下でのアンモニア・ボラン水解の触媒試験
- 反応メカニズムを解明するために,D2Oを用いた運動同位体効果を含む運動研究.
主要な成果:
- 最適化されたNi2Pt@ZIF-8触媒は,個別のNiまたはPt触媒を上回る,H2の放出に対する例外的な効率と選択性を示した.
- 最良の触媒は,環境条件下で600 molH·molcatal-1と2222 molH·molPt-1の回転頻度 (TOF) を達成した.
- NaOHは,Ni2Pt@ZIF-8でH2の進化を著しく強化したが,Pt@ZIF-8でそれを阻害し,ユニークなシナージ効果を示した.
- 速度を決定するステップとして,オキシダティブ添加によるO-H結合の割れ方を特定した.
結論:
- ZIF-8に埋め込まれた合金Ni-Ptナノ粒子は,アンモニア・ボランの水解に非常に効果的な触媒システムです.
- 観測されたNiとPtのポジティブなシネージは,ZIF-8のサポートの性能と組み合わせて,H2生成のための触媒設計において重要な進歩を提供します.
- この研究は,水素に富んだ基板から便利なH2の生産のための触媒の将来の開発に道を開きます.
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