CATALYST FOR REDUCING AMOUNT OF NITROGEN OXIDE IN EXHAUST GAS FROM LEAN-BURN ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a catalyst which has an improved heat stability, a wider temperature window, and a high nitrogen oxide conversion rate.

SOLUTION: The catalyst for reducing the amount of nitrogen oxide in an exhaust gas from a lean-burn engine comprises at least one nitrogen oxide storage material prepared by combining at least one platinum group noble metal with a uniform Mg/Al mixed oxide of magnesium oxide and aluminum oxide, wherein the magnesium oxide is present in a concentration of about 1-40 wt.% on the basis of the total amount of the Mg/Al mixed oxide.

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