Title:
EXHAUST GAS PURIFICATION CATALYST
Document Type and Number:
WIPO Patent Application WO/2023/182481
Kind Code:
A1
Abstract:
Provided is an exhaust gas purification catalyst comprising: a substrate provided with inflow-side cells, outflow-side cells, and porous partition walls; a first catalytic layer; and a second catalytic layer and a third catalytic layer in which the noble metal element that has the greatest metal-equivalent content is Rh and Pt, respectively, wherein: the first catalytic layer is formed on the inflow-side cell side of the partition walls, along an exhaust gas flow direction from an exhaust gas inflow-side end of the partition walls; the second catalytic layer is formed on the outflow-side cell side of the partition walls, along a direction opposite to the exhaust gas flow direction from an exhaust gas outflow-side end of the partition walls; the third catalytic layer is formed over the second catalytic layer such that at least part of the third catalytic layer protrudes out to the outflow-side cell side from an outflow-side cell-side outer surface of the partition walls; and the ratio of the mass of the third catalytic layer per unit volume at a portion of the substrate where the third catalytic layer is formed to the mass of the second catalytic layer per unit volume at a portion of the substrate where the second catalytic layer is formed is 0.3 to 1.9.
Inventors:
AKITA SHINGO (JP)
KURIHARA HIROKI (JP)
KURIHARA HIROKI (JP)
Application Number:
PCT/JP2023/011744
Publication Date:
September 28, 2023
Filing Date:
March 24, 2023
Export Citation:
Assignee:
MITSUI MINING & SMELTING CO LTD (JP)
International Classes:
B01J35/04; B01D53/94; B01J23/63; F01N3/022; F01N3/10; F01N3/28
Domestic Patent References:
| WO2020039650A1 | 2020-02-27 | |||
| WO2016060049A1 | 2016-04-21 | |||
| WO2021029098A1 | 2021-02-18 | |||
| WO2021125256A1 | 2021-06-24 |
Foreign References:
| JP2020193568A | 2020-12-03 |
Attorney, Agent or Firm:
MIYAJIMA Manabu et al. (JP)
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