B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 46/24 (2006.01) B01D 33/00 (2006.01) B01D 53/94 (2006.01) B01J 23/58 (2006.01)
Patent
CA 2635082
An exhaust gas-purifying catalyst is disclosed. The catalyst includes a filter substrate having a wall flow structure and a catalyst bed formed on cell partition walls of the filter substrate. The catalyst bed contain a porous oxide, a noble metal supported on the porous oxide, and an alkali metal supported on the porous oxide in an amount of 0.6 mole or more per 1L of the filter substrate. Since a large amount of alkali metal is supported, the alkali metal is likely to contact particulate material(PM) mainly containing carbon. Accordingly, the oxidation temperature of the PM can be lowered. Thus, it is possible to oxidize PM even at a low temperature of 300 ~C or below.
Catalyseur de purification de gaz d'échappement, qui comprend un substrat filtrant à structure de flux de paroi et un lit catalytique formé sur des parois de séparation de cellule de ce substrat. Le lit catalytique comprend un oxyde poreux, un métal noble soutenu sur l'oxyde poreux, et enfin un métal alcalin soutenu sur l'oxyde poreux en quantité de 0,6 mole ou plus par litre de substrat filtrant. Étant donné qu'une grande quantité de métal alcalin est soutenue, le métal alcalin peut entrer en contact avec un matériau particulaire contenant essentiellement du carbone. En conséquence, la température d'oxydation du matériau particulaire peut être abaissée. Ainsi, il est possible d'oxyder ce matériau même à une température faible de 300° C ou moins.
Kato Hitoshi
Ogura Yoshitsugu
Gowling Lafleur Henderson Llp
Toyota Jidosha Kabushiki Kaisha
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