期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 96, 期 9, 页码 2461-2471出版社
WILEY
DOI: 10.1002/jctb.6812
关键词
scale-up; electrochemical cell; CO2 reduction; formate; electrodialysis; KOH recovery
类别
资金
- EPSRC Multi-Disciplinary Fuels RCUK Energy Programme
- Liquid Fuels and Bioenergy from CO2 Reduction (Lifes-CO2R) Project [EP/N009746/1]
- FLEXIS research project [WEFO 80835]
- Royal Academy of Engineering Fellowship Chair in Emerging Technologies [CiET1819/2/86]
- EPSRC [EP/N009746/1] Funding Source: UKRI
The study proposed a scalable reactor system for electrochemical CO2 reduction to formate, which is a precursor for the production of fuels, pharmaceuticals, and fertilizers. The results showed that formic acid can be efficiently produced in a short period of time with specific parameters, although further optimization of systems and operating strategies is needed.
BACKGROUND The concept of carbon dioxide (CO2) conversion to formate has attracted increasing interest in recent years and various small-scale studies are present in the literature. However, upscaling of electrochemical CO2 reduction comes with many challenges and there are very few reports available on it. In this study, we present a scalable three-chamber reactor system for electrochemical CO2 reduction to formate, a precursor suitable for the production of fuels, pharmaceuticals and fertilizers and its extraction as pure formic acid by electrodialysis. RESULTS The reactor produced 11.7 g L-1 formic acid in 6 h, i.e. 1.95 g L-1 h(-1) at -1.8 V applied potential, 5 mol L-1 KOH as an electrolyte, GDE (gas diffusion electrode) cathode with SnO2 catalyst and Nafion (TM) 200 membrane. The maximum Faradaic efficiency achieved was 38%. In addition, recovery of the formate is equally important as its production for use as feedstock to form chemicals. We therefore also investigated the extraction of formic acid through conventional electrodialysis (CED) and bipolar membrane electrodialysis (BMED). The formic acid was extracted with 88% recovery using CED and 46% with BMED. Furthermore, BMED resulted in recovery of >95% K+ as base and 12 L pure CO2 for possible recycling to the electrochemical cell. CONCLUSION We consider this study to provide essential empirical evidence on factors influencing the scale-up and subsequent performance of a liquid electrolyte-based electrochemical CO2 reduction reaction (CO2RR) system to formate and its extraction at scale. However, optimized systems and operating strategies still need further investigation, and constituent materials, particularly in terms of membranes and cathode catalyst, need to be developed. (c) 2021 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).
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