Abstract
The electrohydrodimerization (EHD) of acrylonitrile (AN) to adiponitrile (ADN) has been examined using the electroanalytical techniques of cyclic voltammetry (CV), rotating disk electrode voltammetry (RDE) as well as differential capacitance measurements. The results confirm the formation of a hydrophobic reaction layer adjacent to the electrode surface. The evidence derives from three sources: (i) hydrogen evolution suppression with quaternary ammonium salt (QAS) addition, (ii) double layer capacitance data which verifies co-adsorption of QAS and ADN and (iii) RDE voltammetry data which shows AN diffusion through the compact layer limits the current. Differential capacitance measurements are seen as a means for selection of candidate QAS's for the EHD process.
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