| 摘要 |
In a catalyst body using a direct support, this invention provides a ceramic catalyst body capable of preventing degradation resulting from aggregation of catalyst components, excellent in low thermal capacity and low pressure loss and having excellent catalytic performance and high durability. Catalyst particles prepared by supporting a catalyst metal such as Pt on intermediate substrate particles and an assistant catalyst of a metal oxide such as CeO2 are directly supported on a ceramic support using cordierite, a part of constituent elements of which is replaced, as a substrate and capable of directly supporting the catalyst components on replacing elements so introduced. Even when the CeO2 particles having low bonding strength move, the catalyst metal such as Pt is prevented from moving and aggregating because it is bonded to the intermediate substrate particles, and catalyst performance can be maintained for a long time.
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