Exhaust gas-purifying three-way catalyst

Abstract

Provided is, for example, an exhaust gas-purifying three-way catalyst which is small in the amount of a platinum group element used, which can be early increased in temperature to a catalytically active temperature, which is suppressed in degradation in performance due to a catalyst poison included in an exhaust gas even if placed directly under an engine, and which is excellent in purification performance. An exhaust gas-purifying three-way catalyst including at least a catalyst carrierand a catalyst layer, wherein the catalyst layerhas a layered structure having at least a first catalyst layer L, a second catalyst layer Land a third catalyst layer Lin the listed order, the first catalyst layer Lcontains a first composite catalyst particle including palladium supported on a first base material particle, the second catalyst layer Lcontains a second composite catalyst particle including rhodium supported on a second base material particle, the third catalyst layer Lcontains a third composite catalyst particle including palladium supported on a third base material particle, and the total coating weight Wt in the catalyst layers L, L, and L(provided that the platinum group element included in each of the catalyst layers is excluded) is 110 g/L or more and 225 g/L or less in total, per volume of the catalyst carrier