CATALYST FOR EXHAUST GAS CLEANING

摘要

An exhaust gas purifying catalyst that exhibits purifying performance even at high temperatures. The catalyst carries an alkali metal and a noble metal on a crystalline zirconium composite oxide, wherein the zirconium composite oxide is one in which zirconium is partly substituted with at least one kind of element selected from the group consisting of an alkaline earth metal, a rare earth metal and an element of the group IIIB, and the elongation of the crystal lattice due to the substitution with the element assumes a nearly theoretical value.