Patents by Inventor Willem Vreugdenhil

Willem Vreugdenhil 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).

  • Non-oxide metal ceramic catalysts comprising metal oxide support and intermediate ceramic passivating layer
    Patent number: 5338716
    Abstract: Supported non-oxide metal carbide-containing catalysts are provided which comprise: (a) an oxide support, such as alumina or cordierite; (b) a passivating layer of a ceramic, such as silicon carbide; and (c) a non-oxide metal ceramic catalytic component, such as a Group VI metal carbide or nitride, preferably tungsten carbide or molybdenum carbide.
    Type: Grant
    Filed: December 1, 1992
    Date of Patent: August 16, 1994
    Assignee: Akzo Nobel nv
    Inventors: Kelly B. Triplett, Johst H. Burk, Fawzy G. Sherif, Willem Vreugdenhil
  • Sulfur-resistant hydrogenation catalyst and process for hydrogenation using same
    Patent number: 5330944
    Abstract: Tungsten carbide/zeolite catalysts useful in the hydrogenation of unsaturated sulfur containing compounds and in particular in the production of tetrahydrothiophene are provided.Also provided is a process for the production of tetrahydrothiophene from thiophene using the tungsten carbide/zeolite catalysts taught, which effects the selective production of tetrahydrothiophene without producing large quantities of H.sub.2 S and unwanted hydrocarbons.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: July 19, 1994
    Assignee: Akzo Nobel NV
    Inventors: Fawzy G. Sherif, Willem Vreugdenhil
  • Hydrogenation of nitriles by a tungsten carbide catalyst
    Patent number: 5321161
    Abstract: Nitriles can be hydrogenated to amines by heating the nitrile in the presence of hydrogen and a tungsten carbide catalyst, such as are formed by the calcination of a tungsten salt with an acyclic compound containing-nitrogen-hydrogen bonding.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: June 14, 1994
    Assignee: Akzo nv
    Inventors: Willem Vreugdenhil, Fawzy G. Sherif, Johst H. Burk, James F. Gadberry