To provide a catalyst for treating exhaust having excellent thermal durability.
The catalyst for cleaning exhaust is comprised of rhodium particles 1 having catalytic activity, chemical compound particles 2 formed on the circumferences of the rhodium particles 1 in a manner supporting the rhodium particles 1, and an oxide 3 that is formed on the circumferences of the chemical compound particles 2 and suppresses the coagulation of the chemical compound particles 2. It is preferable that the mean diameter of the primary particles of the oxide 3 is greater than the mean mesopore diameter of an aggregate of the chemical compound particles 2 and the rhodium particles 1 exclusively contact the chemical compound particles 2 without contacting the oxide 3.
COPYRIGHT: (C)2008,JPO&INPIT
Kazuyuki Shiratori
Hironori Wakamatsu
Katsuo Suga
Renault S.A.S.Societe Pa Action Samprife
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Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu