CATALYST FOR PURIFICATION OF EXHAUST GAS

PURPOSE: To enhance the NOx removing performance of a catalyst for purification of exhaust gas contg. both of a barium compd. and cerium oxide by carrying at least one of Pd and Pt on each of porous carriers separately contg. the barium compd. and cerium oxide. CONSTITUTION: This catalyst consists o...

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Hauptverfasser:	NAGAI MAYUKO, SAIKI MOTOHISA, TANABE TOSHITAKA, SHINJO HIROBUMI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE: To enhance the NOx removing performance of a catalyst for purification of exhaust gas contg. both of a barium compd. and cerium oxide by carrying at least one of Pd and Pt on each of porous carriers separately contg. the barium compd. and cerium oxide. CONSTITUTION: This catalyst consists of a carrier substrate 1, a 1st catalyst carrying layer 2 formed on the surface of the substrate 1 and contg. at least one of Pd and Pt, cerium oxide and alumina, and a 2nd catalyst carrying layer 3 formed on the surface of the layer 2 and contg. at least one of Pd and Pt, a barium compd. and alumina. The porous carriers of the layers 2, 3 are preferably made of activated alumina and the total amt. of Pd or Pt carried is preferably 0.05-30g per 1l of this catalyst. The contents of the barium compd. and cerium oxide are preferably 0.01-1.0mol and 0.01-3.0mol per 1l of this catalyst, respectively.