Patents Assigned to Johnson Matthey Japan Ltd.
  • Exhaust gas clean-up catalyst
    Patent number: 6645439
    Abstract: Exhaust gas clean-up catalysts that contain one or two or more noble metals chosen from the group platinum (Pt), rhodium (Rh), ruthenium (Ru), Iridium (Ir), osmium (Os) and other noble metals, and at least one of tungsten (W) metal or tungsten oxide and, optionally, at least one of niobium (Nb) metal, niobium oxide, molybdenum (Mo) metal, or molybdenum oxide, and which can also contain the metal oxide(s) ceria and/or zirconia if necessary, are especially useful for cleaning up hydrocarbons in exhaust gases.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: November 11, 2003
    Assignee: Johnson Matthey Japan Ltd.
    Inventors: Geng Zhang, Tomotaka Hirota, Yasunori Kurashima, Hideaki Muraki