Bimetallic platinum or silver based supported catalyst, its preparation and use in electrochemical cells

摘要

A stable bi-metallic catalyst comprises an electronic conducting support and a metallic coating comprising a metal M1 chosen from Pt and Ag and a second metal M2 different from M1 and chosen from Pt, Ag, Au, Rt, Ir, R and Os. An Independent claim is also included for the preparation of the catalyst comprising (a) impregnating the conducting support by a solution of the metal salt M1 chosen from Pt or Ag and by a solution of the metal salt M2 chosen from Pt or Ag, Au, Ru, Ir, R, Os; (b) evaporating slowly under stirring and under inert gas bubbling; (c) drying of the powder at atmospheric pressure at 60-80 degrees C, then under reduced pressure at 90-110 degrees C; and (d) heating of the resulting powder under hydrogen at 300-600 degrees C. The heat rate was 0.2-1.5 degrees C/min and the soak time was 20 hours or preferably 2-16 hours.