Anodische oxydation zu kohlendioxid von kohlenwasserstoffen, alkoholen und carbonsäuren an Raney-Platin

Abstract

Knowledge of the mechanism involved in the anodic oxidation of hydrocarbons is of particular importance to the development of catalysts for low-temperature fuel cells. Galvanostatic measurements of current-voltage curves and potentiostatic-coulometric determinations of the conversion of hydrocarbons, alcohols, aldehydes, ketones and carboxylic acids in acid and alkaline electrolytes, performed on Raney platinum at temperature between 25 and 100°C, permit conclusions to be drawn on the reaction mechanism of the oxidation. The periodic current-voltage curves obtained by the triangular voltage sweep method show the differences in the sorption of hydrogen, oxygen, saturated and unsaturated hydrocarbons. In addition, the periodic current-voltage curves give indications of the mechanism involved. At open circuit, the saturated hydrocarbon is converted with water into hydrogen and carbon dioxide, the amount converted corresponding approximately to the thermodynamic equilibrium.