Patents Assigned to Nippon Engelhard Ltd.
  • Platinum alloy electrocatalyst and acid-electrolyte fuel cell electrode using the same
    Patent number: 4794054
    Abstract: A platinum alloy electrocatalyst composed of a platinum-iron-cobalt alloy comprising 40 to 80 atomic percent of platinum, 10 to 40 atomic percent of iron and 10 to 40 atomic percent of cobalt supported on a suitable carrier has outstandingly high stability and catalytic activity. Electrodes using such an electrocatalyst (particularly when used as cathodes in acid-electrolyte fuel cells) remain stable for longer periods and have more than 30% higher output than electrodes using conventional catalysts.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: December 27, 1988
    Assignee: Nippon Engelhard Ltd.
    Inventors: Takashi Ito, Shigemitsu Matsuzawa, Katsuaki Kato
  • Platinum-copper alloy electrocatalyst and acid-electrolyte fuel cell electrode using the same
    Patent number: 4716087
    Abstract: A platinum alloy electrocatalyst, composed of a platinum-copper alloy containing 15 to 50 atomic percent of copper (the balance being platinum) and supported on a suitable carrier, shows high activity over long periods because of the enhanced specific activity of supported metal and improved maintainability of its specific surface area. Thus acid-electrolyte fuel cells using the electrode comprising such an electrocatalyst feature better output performances and longer service life than fuel cells using conventional electrodes.
    Type: Grant
    Filed: December 10, 1986
    Date of Patent: December 29, 1987
    Assignee: Nippon Engelhard Ltd.
    Inventors: Takashi Ito, Shigemitsu Matsuzawa, Katsuaki Kato
  • Material for adsorbing iodine and method for preparing thereof
    Patent number: 4382879
    Abstract: An adsorbing material comprising a porous body having larger pores of a mean pore diameter of 200 to 2000 A and smaller pores of a mean pore diameter of 40 to 200 A on the surfaces of the larger pores, said porous body being impregnated with a metal such as silver, copper, etc., or a salt thereof such as silver nitrate, etc., has excellent adsorbing performance for iodine and/or organic iodine compounds under any degree of humidity.
    Type: Grant
    Filed: February 4, 1981
    Date of Patent: May 10, 1983
    Assignees: Hitachi, Ltd., Nippon Engelhard, Ltd.
    Inventors: Kiyomi Funabashi, Kunio Kamiya, Makoto Kikuchi, Toshio Takagi, Morimasa Hashimoto, Mitsuyoshi Ichimura
  • Iodine adsorbent
    Patent number: 4234456
    Abstract: An iodine adsorbent comprises an alumina carrier having a large number of pores having a mean pore size of 200 to 2,000 A and silver supported on the alumina carrier. The alumina carrier has a pore volume of at least about 0.1 cc/g.High percent iodine removal is obtained in a highly humid atmosphere, and an amount of silver supported on the carrier is much reduced.
    Type: Grant
    Filed: June 13, 1978
    Date of Patent: November 18, 1980
    Assignees: Hitachi, Ltd., Nippon Engelhard Ltd.
    Inventors: Kunio Kamiya, Hideo Yusa, Masao Kitamura, Masaki Takeshima, Toshio Ishidate