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Closing the Gap: Towards a Fully Continuous and Self-Regulated Kolbe Electrosynthesis
- In this article, we address the transition of the Kolbe electrolysis of valeric acid (VA) to n-octane as an exemplary electrosynthesis process from a batch reaction to a continuous, self-regulated process. Based on a systematic assessment of chemical boundary conditions and sustainability aspects, we propose a continuous electrosynthesis including a simple product separation and electrolyte recirculation, as well as an online-pH-controlled VA feeding. We demonstrate how essential performance parameters such as product selectivity (S) and coulombic efficiency (CE) are significantly improved by the transition from batch to a continuous process. Thus, the continuous and pH-controlled electrolysis of a 1 M valeric acid, starting pH 6.0, allowed a constantly high selectivity of around 47 % and an average Coulomb efficiency about 52 % throughout the entire experimental duration. Under otherwise identical conditions, the conventional batch operation suffered from lower and strongly decreasing performance values (Sn-octane, 60min=10.4 %, Sn-octane, 240min=1.3 %; CEn-octane, 60min=7.1 %, CEn-octane, 240min=0.5 %). At the same time, electrolyte recirculation significantly reduces wastes and limits the use of electrolyte components.
Author: | Patrick Drögemüller, Tobias Stobbe, Uwe Schröder |
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URN: | urn:nbn:de:gbv:9-opus-109244 |
DOI: | https://doi.org/10.1002/cssc.202300973 |
ISSN: | 1864-564X |
Parent Title (English): | ChemSusChem |
Publisher: | Wiley |
Place of publication: | Hoboken, NJ |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/09/07 |
Date of first Publication: | 2024/01/22 |
Release Date: | 2024/03/25 |
Tag: | Chemostatic processes; Continuous electrosynthesis; Green chemistry; Kolbe reaction; Valeric acid |
Volume: | 17 |
Issue: | 2 |
Article Number: | e202300973 |
Page Number: | 9 |
Faculties: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie |
Collections: | weitere DFG-förderfähige Artikel |
Licence (German): | Creative Commons - Namensnennung-Nicht kommerziell 4.0 International |