Patent ID: 7785540

Claim:
Exhaust emission control device of an internal combustion engine with a support which has a catalytically active coating for absorbing oxygen in the reduction of the exhaust gas and for releasing oxygen in the oxidation of the exhaust gas, including a lambda proble, wherein the catalytically active coating comprises different materials (A, B, C) which can store oxygen and which each form a component storage unit (MA, MB, MC) for the oxygen(O 2 ), and wherein the first material (A) at lambda λ<1 changing its oxidation stage and constituting a first component storage unit (MA) for oxygen (O 2 ), the second material (B) at lambda λ=1 changing its oxidation stage and constituting a second component storage unit (MB) for oxygen (O 2 ), and the third material (C) at lambda λ>1 changing its oxidation stage and constituting a third component storage unit (MC) for oxygen (O 2 ).