CATALYST FOR PURIFYING EXHAUST GAS

摘要

PURPOSE:To provide a catalyst for purifying exhaust gas effectively acting even within a lean burn region wherein the air/fuel ratio of an internal combustion engine such as a car engine is low and excellent in heat resistance and durability even when the catalyst is used for a long time at high temp. CONSTITUTION:In a catalyst for purifying exhaust gas obtained by further adding at least one kind of a metal component selected from a group consisting of alkali metal, alkaline earth metal and rare earth metal to a catalyst obtained by adding a copper(Cu) component and a phosphorous(P) component to inorg. matter based on crystalline aluminosilicate, the contents of Cu and P are respectively set to 4-15wt.% and 0.01-1.7wt.% with respect to crystalline aluminosilicate from which adsorbed water is removed.