Conversion of Ammonia to Hydrazine Induced by High-Frequency Ultrasound
© 2021 Wiley-VCH GmbH..
Hydrazine is a chemical of utmost importance in our society, either for organic synthesis or energy use. The direct conversion of NH3 to hydrazine is highly appealing, but it remains a very difficult task because the degradation of hydrazine is thermodynamically more feasible than the cleavage of the N-H bond of NH3 . As a result, any catalyst capable of activating NH3 will thus unavoidably decompose N2 H4 . Here we show that cavitation bubbles, created by ultrasonic irradiation of aqueous NH3 at a high frequency, act as microreactors to activate and convert NH3 to NH species, without assistance of any catalyst, yielding hydrazine at the bubble-liquid interface. The compartmentation of in-situ-produced hydrazine in the bulk solution, which is maintained close to 30 °C, advantageously prevents its thermal degradation, a recurrent problem faced by previous technologies. This work also points towards a path to scavenge . OH radicals by adjusting the NH3 concentration.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:60 |
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| Enthalten in: |
Angewandte Chemie (International ed. in English) - 60(2021), 48 vom: 22. Nov., Seite 25230-25234 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Humblot, Anaelle [VerfasserIn] |
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| Links: |
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| Themen: |
Ammonia |
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| Anmerkungen: |
Date Revised 15.11.2021 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1002/anie.202109516 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Hydrazine is a chemical of utmost importance in our society, either for organic synthesis or energy use. The direct conversion of NH3 to hydrazine is highly appealing, but it remains a very difficult task because the degradation of hydrazine is thermodynamically more feasible than the cleavage of the N-H bond of NH3 . As a result, any catalyst capable of activating NH3 will thus unavoidably decompose N2 H4 . Here we show that cavitation bubbles, created by ultrasonic irradiation of aqueous NH3 at a high frequency, act as microreactors to activate and convert NH3 to NH species, without assistance of any catalyst, yielding hydrazine at the bubble-liquid interface. The compartmentation of in-situ-produced hydrazine in the bulk solution, which is maintained close to 30 °C, advantageously prevents its thermal degradation, a recurrent problem faced by previous technologies. This work also points towards a path to scavenge . OH radicals by adjusting the NH3 concentration | ||
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| 650 | 4 | |a radicals | |
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| 700 | 1 | |a Allavena, Audrey |e verfasserin |4 aut | |
| 700 | 1 | |a Amaniampong, Prince N |e verfasserin |4 aut | |
| 700 | 1 | |a De Oliveira Vigier, Karine |e verfasserin |4 aut | |
| 700 | 1 | |a Chave, Tony |e verfasserin |4 aut | |
| 700 | 1 | |a Streiff, Stéphane |e verfasserin |4 aut | |
| 700 | 1 | |a Jérôme, François |e verfasserin |4 aut | |
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