“…[1][2][3] Manganese oxides, together with copper and cobalt oxides, are considered as possible replacement of platinum metals in automobile catalysts for purification of exhaust gases from CO, CHx, NOx. 4,5 The catalysts, obtained by their combination with the oxides of some metals of variable valency and with the metals of platinum group (Pt, Pd) or Ag, exhibit the mutual-promoting effect in the oxidation reaction. 6,7 Simultaneously they retain the high activity after calcination over prolonged period at high temperatures.…”