化学的ループ式酸化脱水のための二重機能のMo-V-O混合酸化物における調節格子酸素
Sai Chen1, Liang Zeng1, Rentao Mu1
1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology , Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300072 , China.
Journal of the American Chemical Society
|November 9, 2019
まとめ
二重機能のMo-V-O混合酸化物は,化学的ループによる酸化脱水化 (CL-ODH) を使用してプロパンからプロピレンへの選択的変換を可能にします. このアプローチはプロピレンの高い選択性と収量を達成し,アルカン脱水化のための従来の方法の限界を克服します.
科学分野:
- カタリシス
- 材料科学
- 化学工学
背景:
- 酸素化学は,アルカン脱水化における選択的なC−H結合分裂に不可欠である.
- 従来の酸化脱水化 (ODH) は,過酸化によるアルケンの選択性が低いことが多い.
- 選択的なアルカン機能化のための効率的な触媒の開発は,依然として重要な課題です.
研究 の 目的:
- プロパンをプロピレンに選択的に変換するための新しい触媒システムを開発する.
- 化学ループによる酸化脱水化 (CL-ODH) の代替アプローチを調査する.
- 選択性の強化における金属と酸素の相互作用の役割を理解する.
主な方法:
- 二重機能のMo-V-O混合酸化物の合成と特徴付け
- 500 °Cでのプロパン脱水化における触媒性能の評価
- 格子酸素と原子規模のドーピングを含む反応機構の調査.
- 100回の脱水再生サイクルにおける触媒の安定性の分析
主要な成果:
- Mo-V-O触媒を用いてプロパンの変換で89%のプロピレン選択性を達成した.
- 100サイクル以上で高い触媒の安定性を示した.
- Moドーピングによる大量格子酸素の精密な調節が選択性の鍵として特定された.
- プロピレンの選択性には,V-O結合エネルギーの増加が重要であることが示された.
結論:
- Mo-V-O触媒を用いたCL-ODHアプローチは,選択的なアルカン脱水化のための有望な戦略を提供します.
- 原子スケールのドーピングと金属-酸素結合の調節は,触媒の性能にとって極めて重要です.
- この研究は,選択的酸化反応のための金属-酸素化学に関する基本的な洞察を提供します.
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