Sustainable Synthesis of Adipic Acid via MnO<sub>x</sub>-Catalyzed Electrooxidation of Cyclohexanol in Neutral Electrolyte

Sustainable Synthesis of Adipic Acid via MnO<sub>x</sub>-Catalyzed Electrooxidation of Cyclohexanol in Neutral Electrolyte

Adipic acid (AA), a pivotal precursor for nylon-6,6 and polyurethane, was synthesized via an innovative catalytic electrocatalytic oxidation strategy in this study. Four distinct MnO<sub>x</sub>/CNT nanocatalysts were prepared by hydrothermal and co-precipitation methods and fabricated i...

Full description

Saved in:
Bibliographic Details
Main Authors: Jiaming Shi, Guiling Zhang, Shiying Yang, Dan Yang, Yuguang Jin, Xiaoyue Wan, Yihu Dai, Yanhui Yang, Chunmei Zhou
Format: Article
Language:English
Published: MDPI AG 2025-07-01
Series:Molecules
Subjects:
manganese dioxide catalyst
cyclohexanol
electrooxidation
adipic acid
neutral solution
Online Access:https://www.mdpi.com/1420-3049/30/14/2937
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Adipic acid (AA), a pivotal precursor for nylon-6,6 and polyurethane, was synthesized via an innovative catalytic electrocatalytic oxidation strategy in this study. Four distinct MnO<sub>x</sub>/CNT nanocatalysts were prepared by hydrothermal and co-precipitation methods and fabricated into electrodes for the oxidation of cyclohexanol (Cy-OH) in a K<sub>2</sub>SO<sub>4</sub> neutral solution. Comprehensive characterization revealed that the catalytic performance depended on both crystalline phase configuration and manganese valence states. MnO(OH) and MnO<sub>x</sub> were identified as the main active species, with the synergy between MnO species and carbon nanotubes significantly enhancing catalytic activity. Mechanistic investigations demonstrated that under Mn<sup>4+</sup>-dominant conditions, low-valence manganese species facilitated Cy-OH-to-cyclohexanone (Cy=O) conversion, while an optimal O<sub>ads</sub>/O<sub>lat</sub> ratio (≈1) effectively promoted subsequent Cy=O oxidation to AA. Under optimized conditions (1.25 V vs. Ag/AgCl, 80 °C, 15 h), complete Cy-OH conversion was achieved with 56.4% AA yield and exceptional Faradaic efficiency exceeding 94%. This work elucidates manganese-based electrocatalytic oxidation mechanisms, proposes a sequential reaction pathway, and establishes an environmentally benign synthesis protocol for AA, advancing sustainable industrial chemistry.
ISSN:1420-3049

Similar Items