カタリストサポートとしての金属有機フレームワークの限界を押し広げること:オキシレンイソメリゼーションと不釣り合いのためのNU-1000サポートトングステン触媒
Sol Ahn, Scott L Nauert, Cassandra T Buru
1Department of Chemistry, Faculty of Science , King Abdulaziz University , Jeddah 21589 , Saudi Arabia.
Journal of the American Chemical Society
|June 19, 2018
まとめ
この研究は,NU-1000金属有機フレームワーク (MOF) 内のフォスフォトンジス酸 (PTA) がオキシレンイソメリゼーションを効果的に触媒化することを示しています. 閉じ込められた構造は,高度な炭化水素処理のためのMOFを展示するユニークなトランスメチル化経路を可能にします.
科学分野:
- キャタリシス
- 材料科学
- 石油化学
背景:
- 酸触媒による骨格C-C結合イソメリゼーションは,石油化学産業において極めて重要です.
- O-キセレンイソメリゼーション/不均衡化は,強いブロンステッド酸触媒の重要な探査機として機能し,触媒構造に敏感である.
研究 の 目的:
- オキシレンイソメリゼーションのためのNU-1000金属有機フレームワーク (MOF) にカプセル化されたフォスフォタングス酸 (PTA) の触媒活性を調べる.
- 反応条件下でのMOF閉じ込めによる安定性と独特の反応性を評価する.
主な方法:
- PTAを搭載したNU-1000 MOFの合成
- 拡張X線吸収微細構造 (EXAFS),31P NMR,N2物理吸収,X線微分法 (XRD) を用いた特徴付け.
- 523Kでのオキシレン同体化の触媒試験
主要な成果:
- PTAで封じ込められたNU-1000触媒は,特に最大PTA負荷下での反応条件下で構造的安定性を示した.
- WOxクラスターは,触媒活動に不可欠であると特定されました.
- NU-1000内の閉じ込められた環境は,トランスメチル化経路における異常な活動を促進し,隣接する活性サイトを必要とした.
結論:
- メタル・オーガニック・フレームワークのトポロジーは,炭化水素同体化のような困難な反応のためのユニークな反応性へのアクセスを提供することができます.
- 最大のPTA負荷は,触媒の構造的整合性を維持するために不可欠です.
- NU-1000 MOFフレームワークは,対応した反応性を持つ高度な触媒の設計のための有望なプラットフォームを提供します.
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