METHOD AND CATALYST FOR PURIFYING EXHAUST GAS

PROBLEM TO BE SOLVED: To keep high capacity within a low temp. region under an air/fuel ratio change condition and to enhance activity within a high temp. region. SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd...

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Bibliographische Detailangaben
Hauptverfasser:	SAIKI MOTOHISA, SHINJO HIROBUMI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To keep high capacity within a low temp. region under an air/fuel ratio change condition and to enhance activity within a high temp. region. SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd catalyst containing cerium oxide is arranged to the rear stage thereof and exhaust gas is changed to oxidable gas and reducible gas under a condition satisfying 62