CATALYST FOR EXHAUST GAS PURIFICATION

摘要

To improve the degree of CO removal in the stoichiometric to lean atmospheres and prevent an increase in pressure loss. A catalytic coating layer (2) is constituted of a lower layer (20) comprising an oxygen-absorbing/releasing material and an upper layer (21) containing a catalytic noble metal and formed on the surface of the lower layer (20), the thickness of the upper layer (21) being 5-40 mum. The upper layer (21) has excellent gas-diffusing properties and hence the OSC of the oxygen-absorbing/releasing material contained in the lower layer (20) is maximized.