高度オーダーメイドのメソポラスシリカ材料の緑色合成

Guodong Feng^1,2, Jianyu Wang¹, Mercedes Boronat³

¹State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , People's Republic of China.

Journal of the American Chemical Society

|March 29, 2018

まとめ

この研究では,ヒドロキシルフリーラジカルを使用して,オーダーされたメソポラスシリカ (SBA-15) と鉄ドーピングされたSBA-15を合成するための無酸法を導入しています. このグリーンアプローチは材料の性能を高め生産を簡素化します

科学分野:

材料科学
ナノテクノロジー
緑の化学

背景:

オーダーされたメソポラスシリカSBA-15の従来の合成には強い酸が必要です.
強い酸性条件は,結合解離により,鉄のような移行金属をSBA-15に組み込むのを妨げます.

研究の目的:

高度オーダーされたメソポラスSBA-15とFe-SBA-15の酸のない,環境に優しい合成を開発する.
この合成における触媒としてのヒドロキシル自由基の有効性を調査する.

主な方法:

物理的または化学的方法によって生成されたヒドロキシル自由基を用いた水熱合成.
水素基とH+イオンの触媒活性を比較するための密度関数理論 (DFT) の計算.
表面積と金属の負荷に対する合成材料の特性

主要な成果:

酸を使わずに SBA-15 と Fe-SBA-15 を合成しました
準備された材料は,酸で合成された同類のものと比較して,より大きな特定の表面積を示した.
Fe-SBA-15で高鉄負荷効率 (>50%) を達成した.
DFTの計算では,水素素自由基のH+よりも高い触媒活性が,シリカ水解において確認された.

結論:

ハイドロキシルフリーラジカルは,強い酸と比較して,SBA-15とFe-SBA-15の合成に優れた触媒経路を提供します.
このラジカル・ファシリテッド・アプローチは,オーダーされたメソポラス材料を生産するための簡単で,グリーンで,スケーラブルな経路を提供します.
酸触媒方式の限界を克服し,効率的な金属の組み込みを可能にします.

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