Patent ID: 9421528
Filing Date: 2016-08-23
CPC Classification: B01D,B01J,F01N

Claim Text:
1. A catalyst for purifying exhaust gas, comprising: a noble metal; an oxide comprising as a base material A at least two kinds of elements selected from the group consisting of aluminum, zirconium and titanium; and an oxide comprising as a base material B at least one kind of element selected from the group consisting of silicon, cerium, praseodymium and lanthanum; wherein a base material ratio represented by Equation (X): is (a) 0.01 to 8% by weight when the base material B is silicon, (b) 0.01 to 2% by weight when the base material B is cerium, (c) 0.01 or more to less than 2% by weight when the base material B is praseodymium, and (d) 0.01 to 10% by weight when the base material B is lanthanum, wherein an oxide of the aluminum as the base material and an oxide of the zirconium as the base material A, are contained, wherein the oxide of the zirconium is 0.1 to 20% by weight when a total weight of the base material A in terms of oxide is set as 100% by weight.