Patents by Inventor Vojtech Plzak

Vojtech Plzak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6720284
    Abstract: The invention relates to an Au/Fe2O3 catalyst comprised of a particle-shaped, co-catalytically active Fe2O3 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° 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.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: April 13, 2004
    Assignee: Zentrum fur Sonnenenergie- und Wasserstoff Forschung Baden-Wurttemberg Gemeinnutizige Stiftung
    Inventor: Vojtech Plzak
  • Patent number: 6420062
    Abstract: The invention relates to a double layer cathode for molten carbonate fuel cells, containing a first layer (2a) consisting of a first cathode material, preferably lithium-treated nickel oxide, and a second layer (2b) 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° C. The material for the second cathode layer (2b) 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 (2a) as a second cathode (2b), dried and sintered at a high temperature.
    Type: Grant
    Filed: February 23, 2000
    Date of Patent: July 16, 2002
    Assignee: MTU Motoren-und Turbinen-Union Friedrichshafen GmbH
    Inventors: Armin Prohaska, Manfred Bischoff, Bernd Rohland, Vojtech Plzak