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


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.

SUBMITTER: Li Z 

PROVIDER: S-EPMC9411531 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Electrocatalytic synthesis of adipic acid coupled with H<sub>2</sub> production enhanced by a ligand modification strategy.

Li Zhenhua Z   Li Xiaofan X   Zhou Hua H   Xu Yan Y   Xu Si-Min SM   Ren Yue Y   Yan Yifan Y   Yang Jiangrong J   Ji Kaiyue K   Li Li L   Xu Ming M   Shao Mingfei M   Kong Xianggui X   Sun Xiaoming X   Duan Haohong H  

Nature communications 20220825 1


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 H<sub>2</sub> production over a nickel hydroxide (Ni(OH)<sub>2</sub>) cataly  ...[more]

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