| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst for purification of an exhaust gas which has excellent catalytic performance and in which decrease in the catalytic activity is suppressed after the catalyst is used at high temp. for a long time when palladium is used to increase the activity at low temp. (200 to 400 deg.C). SOLUTION: This catalyst for purification of an exhaust gas contains heat- resistant inorg. oxides, serium-based multiple oxide with deposition of palladium, and sulfates which inhibit poisoning of palladium with hydrocarbons in the exhaust gas. Preferably, the sulfates are at least one kind selected from barium sulfate. calcium sulfate, strontium sulfate, cesium sulfate, potassium sulfate, magnesium sulfate, yttrium sulfate and lanthanum sulfate. |
