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Electrocatalytic synthesis of adipic acid coupled with H2 production enhanced by a ligand modification strategy
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Electrocatalytic synthesis of adipic acid coupled with H2 production enhanced by a ligand modification strategy
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Journal Article
Electrocatalytic synthesis of adipic acid coupled with H2 production enhanced by a ligand modification strategy
2022
Overview
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
2
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 H
2
production, attaining adipic acid productivity of 4.7 mmol coupled with H
2
productivity of 8.0 L at 0.8 A (corresponding to 30 mA cm
−2
) in 24 h.
Adipic acid is an important building block of polymers, although its production relies on harmful reagents. Here, authors examined surfactant-modified nickel hydroxide for adipic acid electrosynthesis coupled with hydrogen gas evolution.
