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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
二酸化プラチナカチオン:実験的に生成するのは簡単だが,理論的に記述するのは難しい
M Brönstrup1, D Schröder, I Kretzschmar
1Institut für Organische Chemie, Technischen Universität Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany.
Journal of the American Chemical Society
|March 29, 2001
まとめ
二酸化プラチナカチオン[Pt,O2](+) が生成され,非常に反応性があり,H2やCOのような惰性分子を活性化することができました. この反応性は,触媒変換を可能にしますが,ほとんどの基板では選択性が低下します.
科学分野:
- ガス相無機化学 ガス相無機化学
- カタリシス カタリシス カタリシス
- 計算化学はコンピュータ化学である.
背景:
- プラチナイオンは,様々な触媒プロセスにおいて重要な役割を果たします.
- プラチナ-酸素種の反応性を理解することは,触媒設計において極めて重要です.
研究 の 目的:
- プラチナ (((V) 二酸化炭素カチオン, [Pt,O2) (((+)) を生成し,特徴づけるために.
- 様々な中性基板に対するその反応性を調査する.
- 触媒応用におけるその潜在能力を探求し,その電子構造を理解する.
主な方法:
- Pt ((+)) をN2Oで酸化することによって,ガス相イオン生成.
- 酸化可能および惰性中性分子による反応性研究.
- 構造的特徴とエネルギー最小値を分析するための広範な初期計算研究.
主要な成果:
- [Pt,O2](+) カチオンが成功して生成され,OPtO(+) 構造として識別されました.
- 高反応性で,惰性分子 (H2,CO,CH4) を活性化し,攻撃的反応剤として作用します.
- CO + N2O --> CO2 + N2変換の触媒サイクルが実証され,PtOn+ (n=0-2) の高回転数 (>100) が示されました.
- 高い反応性により,ほとんどの基板の選択性が低下し,例えば,エタンの酸化により10の製品チャネルが得られました.
- アブ・イニシオ・メソッドはシステムを正確に記述したが,DFTはより正確ではなかった.
結論:
- 二酸化プラチナカチオン ([Pt,O2](+)) は,有意な反応性を持つ独特のOPtO(+) 構造を有しています.
- その攻撃的な性質は,挑戦的な基板を活性化するのに有望ですが,選択性を制限します.
- このような反応性種の理解には,計算的方法が不可欠であり,このシステムでは,ab initio方法が,DFTよりも優れた精度を示しています.
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