Catalytic generation of chlorine with slight overpotential by micellar ferrocene |
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| Institution: | 1. Department of Chemistry, University of Pretoria, Private Bag X20, Hatfield, 0028, South Africa;2. Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa;1. Laboratoire de Chimie Physique et Microbiologie pour l’Environnement, UMR 7564, CNRS − Université de Lorraine, 405 rue de Vandoeuvre, 54600 Villers-les-Nancy, France;2. Dipartamento de Ingegneria Industriale, Univesità di Padova, Via Marzolo 9, 35135 Padova, Italy;3. Laboratoire de Cristallographie, Résonance Magnétique et Modélisations, UMR 7036, CNRS − Université de Lorraine, BP 70239, Bd des Aiguillettes, 54506 Vandoeuvre-les-Nancy, France;4. Institut Jean Lamour, UMR 7198, CNRS − Université de Lorraine, Parc de Saurupt, CS 50840, 54011 Nancy, France;1. Department of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;2. Department of Safety Management, Faculty of Environmental and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan |
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| Abstract: | Ferrocene solubilized with poly(vinylpyrrolidone) in aqueous KCl solution exhibited a well-defined voltammetric peak at 1.33 V vs. Ag∣AgCl at a platinum electrode. The wave was attributed to the oxidation of chloride to chlorine, demonstrated by smell of chlorine, by a view of formation of gas bubbles, by coloration through the reaction with diethyl-p-phenylene diamine, and by the increase in the anodic current with the concentration of chloride. Since no wave was observed in the ferrocene-free solution or KCl-free solution in this potential domain, the reaction mechanism was suggested to be the oxidation of chloride into chlorine catalyzed by micellar ferrocene. The potential at the foot of the wave (1.08 V) was less positive that the standard potential of Cl2/Cl−, and hence the reaction may be useful for enhancing the energetic efficiency at chlor-alkali industry. The value of the peak current was one-sixth the theoretical diffusion-controlled current, and was proportional to the square-root of the potential scan rate. |
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