Patent ID: 6797667
Filing Date: 2004-09-28
Classification: B01J,H01M,Y02E

Abstract:
A process for preparing a supported platinum-ruthenium catalyst on a powdered support material, comprising:a. suspending the support material in water to form a suspension; b. heating the suspension at most up to said suspension's boiling point; c. after step b, while maintaining the same temperature and stirring, adding solutions of hexachloroplatinic acid and ruthenium chloride to the suspension; d. after step c, increasing the pH of the suspension to a value between 6.5 and 10 by adding an alkaline solution in order or precipitate hexachioroplatinic acid and ruthenium chloride in the form of sparingly soluble noble metal compounds; e. after step d, adding one or more organic carboxylic acids and/or their salts to the suspension, and reducing the precipitated noble metal compounds by adding a reducing agent to form a catalyst; and f. after step e, washing and drying the catalyst.