CATALYST FOR PURIFYING EXHAUST GAS Russian patent published in 2009 - IPC B01J23/63 B01J21/06 B01J35/00 B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to catalyst for purifying exhaust gas. A catalyst is described, containing: a substrate; and on the substrate, at least a first catalyst bed, containing a cerium oxide - zirconium dioxide composite based carrier which is a Pt or Pd carrier; a second catalyst bed, containing a carrier which contains zirconium dioxide in amount of 60% wt/wt or more, where this carrier is a Rh carrier; a diffusion barrier layer placed between the first catalyst bed and the second catalyst bed and containing metal oxide, wherein this diffusion barrier layer contains CeO₂ or La₂O₃, and thickness of this diffusion barrier layer ranges from 20 mcm to 50 mcm.

EFFECT: prevention of movement of metallic catalyst between layers at high temperature and retention of initial characteristics for long period of time.

8 cl, 3 tbl, 6 ex, 2 dwg