Exhaust gas purification catalyst
AssigneesCataler Corporation, Toyota Jidosha Kabushiki Kaisha
InventorsShintaro KOBAYASHI, Makoto TSUJI, Hiroto IMAI, Takeshi HIRABAYASHI
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Abstract
The present invention provides an exhaust gas purification catalyst provided with: a substrate of wall flow structure in which inlet cells and outlet cells are partitioned by porous partition walls; and a catalyst layer disposed at least inside the partition wall and including a catalyst body. The catalyst layer satisfies the following conditions: (1) the pore volume of pores no larger than 5 μm, as measured in accordance with a mercury intrusion technique, is 24000 mm3 or greater per L of volume of the substrate; and (2) a permeability coefficient measured by a Perm porometer is 0.6 μm2 to 4.4 μm2.
Claims10
An exhaust gas purification catalyst disposed in an exhaust path of an internal combustion engine and configured to purify exhaust gas emitted by the internal combustion engine, the exhaust gas purification catalyst comprising:
- a substrate of wall flow structure where an inlet cell in which an exhaust gas inflow end section is open and an exhaust gas outflow end section is closed, and an outlet cell in which an exhaust gas outflow end section is open and an exhaust gas inflow end section is closed, are partitioned by a porous partition wall;
- and
- a catalyst layer disposed at least inside the partition wall and including a catalyst body,
- wherein the catalyst layer satisfies the following conditions:
- (1) in a relationship between a pore size and a pore volume based on a pore distribution measured in accordance with a mercury intrusion technique, the pore volume of pores no larger than 5 μm is 24000 mm3 or greater per L of volume of the substrate;
- and
- (2) a permeability coefficient measured by a Perm porometer is 0.6 μm2 to 4.4 μm2.
Dependencies are inferred from the claim text.