ウェット・ケミストリー 強い金属サポートの相互作用 タイタニアサポートのAu触媒
Jian Zhang1,2, Hai Wang3, Liang Wang3
1Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry , Zhejiang University , Hangzhou 310028 , China.
Journal of the American Chemical Society
|January 25, 2019
まとめ
新しいウェット・ケミストリー・メソッドにより,タイタニアの黄金触媒に強い金属支柱相互作用 (SMSI) が作られる. このアプローチはナノ粒子のシントリングを回避し,保護性酸化物層を形成することによってCO酸化活動を強化します.
科学分野:
- 異質な触媒
- 材料科学
- ナノテクノロジー
背景:
- 強い金属サポート相互作用 (SMSI) は,サポートされた金属ナノ粒子触媒にとって不可欠です.
- 伝統的なSMSI方法はしばしば高温リドックス処理を含み,ナノ粒子のシンタリングのリスクがあります.
- ナノ粒子の整合性を維持する代替SMSI製造方法が必要である.
研究 の 目的:
- SMSIの構築のための新しいウェット・ケミストリー・メソドロジーを導入する.
- タイタニウム (Au/TiO2) に支えられた金ナノ粒子の湿化学SMSI (wcSMSI) の形成を実証する.
- CO酸化のためのwcSMSI改変した触媒の触媒性能を調査する.
主な方法:
- 水溶液中のAuδ+とTi3+の前駆体間の酸化還元相互作用を含む湿った化学的アプローチを使用した.
- wcSMSIは,Auナノ粒子を覆うTiO xオーバーレイヤを分析することによって特徴づけられた.
- AuとTiO2の間の電子相互作用と,Auナノ粒子のCO吸収抑制を調査した.
主要な成果:
- Au/TiO2ナノ粒子で wcSMSIを成功裏に構築しました.
- TiOxのオーバーレイヤーと 電子相互作用とCO吸収が抑制され, wcSMSIが確認された.
- 改造されたAu-TiO xインターフェースは,CO酸化のための酸素活性化を改善した酸化還元特性を示した.
- オキシード上層は重要な安定性を提供し,シンターに耐性のある触媒を生成しました.
結論:
- ウェット化学SMSI (wcSMSI) は,従来の高温方法の有効な代替手段です.
- wcSMSIアプローチはナノ粒子のシントリングを防止し,触媒活性を増強します.
- 開発されたAu/TiO2-wcSMSI触媒は,CO酸化における優れた性能と安定性を示しています.
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