Exhaust gas purifying apparatus

摘要

In an exhaust gas purifying apparatus including first and second exhaust converters composed of a honeycomb catalytic substrate, arranged in sequence from an exhaust manifold downstream along exhaust gas flow of an engine, wherein the catalytic substrate of the first converter has a heat capacity of not exceeding 0.5 J/K per 1 cm3 in temperatures ranging from room temperature up to 300 DEG C., and the catalytic substrate of the second converter has a geometric surface area of at least 25 cm2/cm3. The first converter purifies exhaust gas immediately after starting up and before completion of warming up of the engine, and the second converter further purifies noxious contents still remaining as being beyond capacity of the first converter.