(19)
(11) EP 2 561 927 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
07.08.2013 Bulletin 2013/32

(88) Date of publication A3:
27.02.2013 Bulletin 2013/09

(43) Date of publication:
27.02.2013 Bulletin 2013/09

(21) Application number: 10850203.0

(22) Date of filing: 20.04.2010
(51) International Patent Classification (IPC): 
B01J 23/52(2006.01)
 H01M 4/88(2006.01)
(86) International application number:
PCT/JP2010/056975
(87) International publication number:
WO 2011/132258 (27.10.2011 Gazette 2011/43)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi-ken, 471-8571 (JP)

(72) Inventor:
  • MIZUTANI, Nobuaki
    Toyota-shi, Aichi-ken, 471-8571 (JP)

(74) Representative: Kuhnen & Wacker 
Patent- und Rechtsanwaltsbüro Prinz-Ludwig-Straße 40A
DE-85354 Freising
DE-85354 Freising (DE)

   


(54) METHOD FOR PRODUCING CATALYST


(57) This invention is intended to improve the coverage of a platinum or platinum alloy surface with gold when producing a catalyst comprising carrier particles that support gold-modified platinum or platinum alloys. The invention provides a method for producing a catalyst comprising carrier particles that support gold-modified platinum or platinum alloys comprising a step of gold reduction comprising adding carrier particles that support platinum or platinum alloys, a reducing agent, and a gold precursor to a liquid medium and mixing the same, wherein the reducing agent is added to adjust the ORP value (i.e., an oxidation-reduction potential with reference to the silver-silver chloride electrode) of the liquid medium to -630 to +230 mV upon completion of addition.