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A catalyst (Cat) is used in the filtration of gases and controls in combination with the lambda probe, the composition of the air-fuel mixture. Furthermore a catalyst contributes to the reduction of pollutants in the exhaust. A vehicle catalyst have within a porous ceramics block with small channels running parallel to the axis. This block is coated with the precious metals platinum, rhodium and palladium, and thus know a high stability. This design is encased and protected by a steel casing that has a barrel-shaped form and is protected by a welded plate from below against splashes.