EXHAUST GAS PURIFICATION CATALYST, AND EXHAUST GAS PURIFICATION CATALYST DEVICE FOR VEHICLES

WIPO Patent Application WO/2023/047185

A1

Provided are: an exhaust gas purification catalyst which is prevented from the poisoning of a noble metal component by an Si-containing compound produced or detached from silicon carbide, is also prevented from the deterioration in exhaust gas purification performance for a long period, and has excellent long-term durability; and others. An exhaust gas purification catalyst 100 has a laminated structure comprising a base material 10, a first coat layer 11 and a second coat layer 21 at least in this order, in which the base material 10 comprises at least one component selected from the group consisting of a silicon carbide support containing silicon carbide and a silicon carbide-coated support having such a structure that a coating layer containing silicon carbide is provided on a support, the first coat layer 11 contains a compound containing at least one alkaline earth metal selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr) and barium (Ba), and the second coat layer 21 contains at least one platinum-group element selected from the group consisting of rhodium (Rh), platinum (Pt) and palladium (Pd).

TAKAYAMA AKITO (JP)
MOCHIZUKI HIROSHI (JP)
NIGORIKAWA SHINJI (JP)

PCT/IB2022/000525

March 30, 2023

September 20, 2022

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N E CHEMCAT CORP (JP)
NISSAN MOTOR (JP)
RENAULT SAS (FR)

B01J27/224; B01D53/94; B01J35/02; F01N3/10

WO2022059772A1

2022-03-24

JP2018161651A	2018-10-18
JP2019510152A	2019-04-11
JP2020081922A	2020-06-04
JP2019173583A	2019-10-10

NEUBECK, Wolfgang et al. (FR)

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