Electrocatalytic synthesis of adipic acid coupled with H2 production enhanced by a ligand modification strategy

Zhenhua Li, Xiaofan Li, Hua Zhou, Yan Xu, Si-Min Xu, Yue Ren, Yifan Yan, Jiangrong Yang, Kaiyue Ji, Li Li, Ming Xu, Mingfei Shao, Xianggui Kong, Xiaoming Sun and Haohong Duan ()
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Zhenhua Li: Beijing University of Chemical Technology
Xiaofan Li: Beijing University of Chemical Technology
Hua Zhou: Beijing University of Chemical Technology
Yan Xu: Shandong University of Science and Technology
Si-Min Xu: Beijing University of Chemical Technology
Yue Ren: Beijing University of Chemical Technology
Yifan Yan: Beijing University of Chemical Technology
Jiangrong Yang: Beijing University of Chemical Technology
Kaiyue Ji: Tsinghua University
Li Li: Beijing Institute of Petrochemical Technology
Ming Xu: Beijing University of Chemical Technology
Mingfei Shao: Beijing University of Chemical Technology
Xianggui Kong: Beijing University of Chemical Technology
Xiaoming Sun: Beijing University of Chemical Technology
Haohong Duan: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Adipic acid is an important building block of polymers, and is commercially produced by thermo-catalytic oxidation of ketone-alcohol oil (a mixture of cyclohexanol and cyclohexanone). However, this process heavily relies on the use of corrosive nitric acid while releases nitrous oxide as a potent greenhouse gas. Herein, we report an electrocatalytic strategy for the oxidation of cyclohexanone to adipic acid coupled with H2 production over a nickel hydroxide (Ni(OH)2) catalyst modified with sodium dodecyl sulfonate (SDS). The intercalated SDS facilitates the enrichment of immiscible cyclohexanone in aqueous medium, thus achieving 3.6-fold greater productivity of adipic acid and higher faradaic efficiency (FE) compared with pure Ni(OH)2 (93% versus 56%). This strategy is demonstrated effective for a variety of immiscible aldehydes and ketones in aqueous solution. Furthermore, we design a realistic two-electrode flow electrolyzer for electrooxidation of cyclohexanone coupling with H2 production, attaining adipic acid productivity of 4.7 mmol coupled with H2 productivity of 8.0 L at 0.8 A (corresponding to 30 mA cm−2) in 24 h.

Date: 2022
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DOI: 10.1038/s41467-022-32769-0

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