Study the Mechanism of the Electrochemical Oxidation of Lignin Model Compounds

Wednesday, 4 October 2017: 09:40
Chesapeake 12 (Gaylord National Resort and Convention Center)
R. Ghahremani (Ohio University) and J. A. Staser (Chemical Engineering)
Lignin has a high potential to be a renewable source of aromatic compounds due to its polyphenolic structure. Electrochemical oxidation of lignin on nickel–cobalt electrodes introduced an environmentally friendly, and economic procedure to convert lignin to other value-added aromatic compounds. However, lack of knowledge about the mechanism of the lignin electrochemical oxidation process, because of the complexity of the molecule, makes the conversion process more elaborate and complex. Understanding the mechanism of the lignin model compounds, which represent building blocks and linkages of lignin molecule, contributes controlling the lignin depolymerization process. Electrochemical study allows us to understand the reaction pathway, and demonstrate the mechanism by the aid of cyclic voltammetry. In this work we have presented the electrochemical oxidation mechanism of the lignin model compounds in the typical three electrode cell beaker using a Pt rotating disc electrode (RDE) as the working electrode. The effects of the concentration of the compounds, supporting electrolyte pH, and working electrode rotation rate have been also studied through cyclic voltammetry experiments.