초록 ▼

Provided is a novel catalyst carrier for exhaust gas which relates to an OSC material containing a ceria-zirconia composite oxide and is able to enhance the low temperature properties and to exert excellent OSC even at the time of engine start and excellent exhaust gas purification performance. A ca

Provided is a novel catalyst carrier for exhaust gas which relates to an OSC material containing a ceria-zirconia composite oxide and is able to enhance the low temperature properties and to exert excellent OSC even at the time of engine start and excellent exhaust gas purification performance. A catalyst carrier for exhaust gas containing a fluorite type ceria-zirconia composite oxide and ceria formed from the fluorite type ceria-zirconia composite oxide by phase separation proposed.

대표청구항 ▼

1. A catalyst carrier for exhaust gas comprising: a fluorite type ceria-zirconia composite oxide; andceria formed from the fluorite type ceria-zirconia composite oxide by phase separation,wherein a peak area ratio of a diffraction peak at 2θ=28.5° to a diffraction peak between 2θ=29.0 to 30.0° deter

1. A catalyst carrier for exhaust gas comprising: a fluorite type ceria-zirconia composite oxide; andceria formed from the fluorite type ceria-zirconia composite oxide by phase separation,wherein a peak area ratio of a diffraction peak at 2θ=28.5° to a diffraction peak between 2θ=29.0 to 30.0° determined from an X-ray diffraction pattern using a CuKα ray obtained by an X-ray diffraction measurement is from 0.05 to 1.00. 2. A catalyst carrier for exhaust gas comprising: the catalyst carrier for exhaust gas according to claim 1 and a catalyst carrier for exhaust gas containing a pyrochlore type ceria-zirconia composite oxide. 3. The catalyst carrier for exhaust gas according to claim 2, wherein a mass ratio of a fluorite type ceria-zirconia composite oxide to a pyrochlore type ceria-zirconia composite oxide is from 20:50 to 65:5. 4. A catalyst composition comprising: Pd; andthe catalyst carrier for exhaust gas according to claim 1. 5. An exhaust gas purifying catalyst comprising: a catalyst layer A containing Pt, Rh, or combination thereof; anda catalyst layer B containing Pd, whereinat least the catalyst layer B contains the catalyst carrier for exhaust gas according to claim 1. 6. The exhaust gas purifying catalyst according to claim 5, wherein Pd is contained at from 0.3 to 8.0% by mass with respect to a total amount of a fluorite type ceria-zirconia composite oxide and ceria formed by phase separation.