メタンからクロロメタンへのメカノ化学的活性化:選択的な急性経路
Marius Bilke1, Pit Losch1, Olena Vozniuk1
1Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany.
Journal of the American Chemical Society
|July 2, 2019
まとめ
機械化学は,軽度な条件下でトリクロイソシアヌル酸 (TCCA) を使用してメタンをクロロメタンに変換するよりグリーンな経路を提供します. この方法は選択性を高め,従来のプロセスと比較して反応温度を下げます.
科学分野:
- 材料化学
- カタリシス
- 緑の化学
背景:
- メタンをクロロメタンに直接変換すると,しばしば厳しい腐食条件があり,副産物混合物が生成されます.
- 既存の方法は,クロロメタン製品のエネルギー密集した分離プロセスを要求します.
研究 の 目的:
- メタンの塩素化のための選択的で無害な機械化学的プロセスを開発する.
- トリクロイソシアヌリック酸 (TCCA) を費用対効果の高い非腐食性塩素剤として使用する.
主な方法:
- ルイス酸 (アルミニウム,セリア) でトリクロイソシアヌリック酸 (TCCA) を粉砕することによって機械化学的活性化.
- 適度な温度 (<150°C) で機能化されたメタン
- メタンの塩化率を最大化するために最適化された反応パラメータ.
主要な成果:
- メタンの最大塩素化速度は0.8μmol (CH4,conv) (g (catalyst) s) −1に達した.
- 機械化学的活性化により,熱的方法 (200 °C) に比べて反応温度 (90 °C) が著しく低下した.
- 30%のメタン変換で高いCH3Cl選択性 (95%) を実証し,熱TCCA反応よりも優れている (選択性66%).
結論:
- 機械化学的戦略は,メタンからクロロメタンへの変換を温和な条件下で選択的かつ効率的に提供します.
- このプロセスは,非腐食性固体塩素化剤 (TCCA) とルイス酸触媒を使用します.
- 塩素化剤の妥当な反応機構と潜在的な再生経路が提案された.
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