Mtu Motoren-und Turbinen-union Friedrichshafen Gmbh

Zentrum Fur Sonnenenergie- Und Wasserstoff Forschung Baden-wurttemberg Gemeinnutizige Stiftung

Vojtech Plzak

Manfred Bischoff

Bernd Rohland

Armin Prohaska

The invention relates to an Au/Fe O catalyst comprised of a particle-shaped, co-catalytically active Fe O supporting material with metallic Au clusters deposited thereupon which have a diameter of less than 4.5 nm. The catalyst materials can be obtained by: a) reacting a water-soluble Fe(III) salt in an aqueous medium with a base; b) impregnating the hydroxide gel which is formed thereby and which is still moist with a solution of a water-soluble Au compound in order to deposit complexed Au clusters on the surface of the hydroxide gel; c) removing water from the suspension of the reaction product formed thereby; d) subjecting the dried reaction product to a calcination at temperatures ranging from 350 and 700&deg; C. The inventive catalyst material is especially suited for selective low-temperature CO oxidation in reformate hydrogen which is used as combustible gas for polymer electrolyte membrane (PEM) fuel cells.

Au/Fe2O3 catalyst materials, method for the production thereof and their use

The invention relates to a double layer cathode for molten carbonate fuel cells, containing a first layer ( ) consisting of a first cathode material, preferably lithium-treated nickel oxide, and a second layer ( ) consisting of cerium-activated lithium cobaltite. The inventive double layer cathode is characterised in that the polarization resistance is less dependent on temperature and in that it has a longer life. The double layer cathode is especially suitable for operating a fuel cell at less than 650&deg; C. The material for the second cathode layer ( ) is produced by activating cobalt oxide by co-precipitation with cerium and treating it with lithium carbonate to form a suspension. Said suspension is then applied to the first cathode layer ( ) as a second cathode ( ), dried and sintered at a high temperature.

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Plochingen, Germany

Vojtech Plzak