Catalyst support particle, production process thereof and exhaust gas purifying catalyst
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinichi Takeshima, Ryo Kiyoyama
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Abstract
A catalyst support particle 10 is disclosed, wherein the particle comprises a zirconia-based metal oxide particle 1, and rare earth oxide-enriched areas 2 dotted on the surface thereof. A production process of a catalyst support particle is disclosed, wherein the process comprises (a) providing a colloidal solution containing a colloidal particle of rare earth hydroxide or oxide, (b) adding a zirconia-based metal oxide particle to the colloidal solution to cause the colloidal particle to be adsorbed and loaded on the surface of the zirconia-based metal oxide particle, and (c) drying and firing the zirconia-based metal oxide particle having the colloidal particle adsorbed and loaded thereon.
Claims6
A catalyst support particle, comprising:
- a zirconia-based metal oxide particle, and rare earth oxide-enriched areas dotted on the surface thereof,
- wherein a molar fraction of a rare earth element in the rare earth oxide-enriched areas is from 0.5 to 10 mol % based on all metal elements in said catalyst support particle,
- wherein the rare earth oxide is an oxide of a rare earth metal element selected from the group consisting of lanthanum, neodymium, and samarium, and
- wherein the catalyst support particle has a BET specific surface area of 14 to 100 m2/g.
Dependencies are inferred from the claim text.