Exhaust gas purifying catalyst and production method thereof

An exhaust gas purifying catalyst, comprising:

• noble metal particles;
• first compounds supporting the noble metal particles and acting as an anchor agent between the first compounds and the noble metal particles, the first compounds being made of a compound of transition metal and suppressing movement of the noble metal particles;
• and
• second compounds forming peripheries around simplexes or aggregates of composite particles including the noble metal particles and the first compounds and covering both the noble metal particles and the first compounds,
• wherein the simplexes or aggregates of the first compounds supporting the noble metal particles are included in sections partitioned by the second compounds, and the movement of the simplexes or aggregates is suppressed within the sections.

An exhaust gas purifying catalyst, comprising:

• noble metal particles;
• first compounds supporting the noble metal particles;
• and
• second compounds which form mesh-like structures to partition simplexes or aggregates of the first compounds supporting the noble metal particles into sections partitioned by the second compounds and covering both the noble metal particles and the first compounds.

An exhaust gas purifying catalyst, comprising:

• noble metal particles;
• first compounds supporting the noble metal particles;
• and
• second compounds which form mesh-like structures to partition simplexes or aggregates of the first compounds supporting the noble metal particles into sections partitioned by the second compounds and covering both the noble metal particles and the first compounds,
• wherein the second compounds include Al2O3 derived from boehmite.

An exhaust gas purifying catalyst, comprising:

• noble metal particles;
• first compounds supporting the noble metal particles;
• and
• second compounds formed on the peripheries of the first compounds on which the noble metal particles are supported and covering both of the noble metal particles and the first compounds,
• wherein a relationship between a size Da of composite particles including the noble metal particles and the first compounds and an average pore diameter Db of the second compounds is Db<Da, and the movement of simplexes or aggregates of the first compounds is suppressed within the sections.