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Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
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水素合成のための電気化学的戦略:アンモニアの代替物の酸化性N-N結合のための方法の開発と過剰潜在的分析
Fei Wang1, James B Gerken1, Desiree M Bates1
1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|June 11, 2020
まとめ
研究者たちは,アンモニアの代替物からヒドラジンを合成する電気化学的方法を探求した. 銅とヨウ素を媒介する経路は,陽子結合経路とは異なり,N-N結合形成のための有望な低過剰ポテンシャルを示した.
科学分野:
- 電気化学
- カタリシス
- 緑の化学
背景:
- 水素は重要な産業用化学物質であり,特に液体燃料電池の燃料である.
- 酸化結合によるアンモニアからの水素素の直接合成は,熱力学的に,そして運動的に困難です.
- ハイドラジン合成のための効率的な電気化学経路の開発は,持続可能な化学生産に不可欠です.
研究 の 目的:
- アンモニアの代用品であるベンゾフェノンイミンの酸化性ホモカップリングのための3つの異なる電気化学的戦略を評価する.
- これらの電気化学的なN−N結合方法の熱力学的効率を決定する.
- 同様の触媒的アプローチを用いて,アンモニアの電子化学的酸化の可能性を評価する.
主な方法:
- ベンゾフェノンイミンの電気化学的酸化ホモカップリングは,陽子結合電子移転,ヨウ素媒介カップリング,銅触媒カップリングの3つの異なる方法を使用して行われます.
- バンゾフェノンアジンの水解により,ヒドラジンと再利用可能なベンゾフェノンが得られる.
- 各電気化学経路の超電位 (η) を測定することによって熱力学的効率の分析.
主要な成果:
- 銅媒介 (η = 390 mV) とヨウ素媒介 (η = 470 mV) のN-N結合プロセスでは低過剰電位が観察された.
- 陽子結合電子伝送経路は,かなり高い超電位 (η ≈ 1.6 V) を示した.
- ベンゾフェノンイミンは,水解時にヒドラジンを生成する有効なアンモニアサロゲートとして機能する.
結論:
- ベンゾフェノンイミンの電気化学的N-N結合は,ヒドラジン合成の有効な経路を提供します.
- 銅とヨウ素による電解は,この変換のための陽子結合経路と比較して優れた熱力学的効率を示しています.
- 発見は,窒素を含む化合物を合成するための効率的な電気化学的方法の開発に洞察を与え,潜在的なアンモニア酸化をダイナトゲンに含みます.
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