| abstract |
There is provided an exhaust gas purifying catalyst device having a three-way catalyst (TWC) particularly excellent in NO x purification performance among carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NO x ) in exhaust gas discharged from a gasoline- A catalyst for purification of exhaust gas containing a porous inorganic oxide carrying rhodium (Rh) and barium sulphate (BaSO 4 ) supported on alumina or not supported thereon, wherein at least a part of Rh is present independently from Ba in the catalyst layer, Wherein the amount of rhodium supported is in the range of 0.05 g / L to 2.0 g / L, the amount of barium sulfate is in the range of 10 to 80% To 0.5 g / L to 25 g / L when it is supported on the support, and from 0.5 g / L to 15 g / L when not supported. |