Abstract
Abstract Bimetallic platinum-bismuth catalysts, supported on active carbon, were employed to oxidise aqueous solutions of glyceric and tartronic acid with air, in a batch reactor. High selectivities for the corresponding keto-acids were obtained under acidic conditions. Glyceric acid was selectively oxidised to hydroxypyruvic acid and maximum yields were obtained at pH 5 (74% at 77% conversion). Tartronic acid was selectively oxidised to mesoxalic acid with highest yields also being obtained at pH 5 (39% at 79% conversion). Analysis of the reaction mixture after 22 hours indicated that leaching of the platinum component of the catalyst was negligible but significant quantities of the bismuth promoter were present (10–17 mg/l).
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