Carrier for internal-combustion engine exhaust gas purification catalyst
An internal combustion engine exhaust gas purifying catalyst carrier has a core body formed of a CeO 2 —ZrO 2 solid solution or a CeO 2 —ZrO 2 —La 2 O 2 solid solution, and CeO 2 supported on the surface of the core body, wherein the core body has a CeO 2 content of 5 to 35 mass % and an La 2 O 2 content of 0 to 10 mass %, on the basis of the mass of the carrier, and the amount of CeO 2 supported on the core body is 5 to 17 mass %, on the basis of the mass of the carrier.
1. An internal combustion engine exhaust gas purifying catalyst carrier comprising:
a core body formed of a CeO 2 —ZrO 2 —La 2 O 3 solid solution, and
CeO 2 supported on the surface of the core body,
wherein the core body has a CeO 2 content of 10 to 30[M] mass % and an La 2 O 3 content of 1 to 10 mass %, and
the amount of CeO 2 supported on the core body is 5 to 10 mass %,
wherein the sum of the amount of CeO 2 in the core body and the amount of CeO 2 supported on the surface of the core body is to 40 mass %,
each mass % being based on the combined mass of the CeO 2 —ZrO 2 —La 2 O 3 core body and supported CeO 2 .
2. The internal combustion engine exhaust gas purifying catalyst carrier according to claim 1 , wherein the core body has an La 2 O 3 content of 2 to 8 mass %, on the basis of the mass of the carrier.
3. The internal combustion engine exhaust gas purifying catalyst carrier according to claim 1 , wherein the ratio of specific surface area (BET) of an aged carrier that has been aged in air at 1000° C. for 25 hours to specific surface area (BET) of a fresh non-aged carrier is between 44.3% and 72.6%.