Exhaust gas purifying catalyst and producing method thereof

An exhaust gas purifying catalyst, comprising:

• a catalyst particle unit including at least noble metal having a catalytic function, first oxides on which the noble metal is supported, and second oxides covering the first oxides on which the catalyst noble metal is supported,
• wherein at least one type of compounds selected from the group consisting of a transition element, an alkali earth metal element, an alkali metal element, and a rare earth element, which is a promoter component, are contained in contact with the second oxides of the catalyst particle units in catalyst powder formed of an aggregate of plural pieces of the catalyst particle units.

An exhaust gas purifying catalyst, comprising:

• a catalyst particle unit including at least noble metal having a catalytic function, first oxides on which the noble metal is supported, and second oxides covering the first oxides on which the catalyst noble metal is supported,
• wherein an oxide is contained, which is formed by complexing the second oxides of the catalyst particle units in catalyst powder formed of an aggregate of plural pieces of the catalyst particle units, and complexing at least one type of compounds selected from the group consisting of a transition element, an alkali earth metal element, an alkali metal element, and a rare earth element, which are a promoter component.