Exhaust gas purification catalyst and exhaust gas purification system comprising same

The multi-layer catalyst design with controlled CeO2 content addresses performance issues during fuel cut and low temperatures, ensuring consistent exhaust gas purification by managing oxygen fluctuations and maintaining stoichiometric composition.

WO2026155182A1PCT designated stage Publication Date: 2026-07-23MITSUI MINING & SMELTING CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
MITSUI MINING & SMELTING CO LTD
Filing Date
2026-01-15
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing exhaust gas purification catalysts face challenges in maintaining effective purification performance during fuel cut (F/C) operations and at low temperatures, particularly due to fluctuations in exhaust gas composition and oxygen concentration, which affect the restoration of Rh's purification performance.

Method used

The catalyst design includes multiple layers with specific compositions and CeO2 content ratios to manage oxygen concentration fluctuations and maintain stoichiometric exhaust gas composition, ensuring consistent purification performance during F/C and low temperatures.

Benefits of technology

The catalyst effectively maintains and restores Rh's purification performance during F/C and at low temperatures by managing oxygen concentration and maintaining stoichiometric exhaust gas composition, enhancing overall purification efficiency.

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Abstract

The present invention addresses the problem of providing an exhaust gas purification catalyst capable of solving problems associated with fuel cuts and of meeting requirements when the temperature of the exhaust gas purification catalyst has not sufficiently risen. In order to solve this problem, the present invention provides an exhaust gas purification catalyst (1A) comprising a first substrate (10A), a first catalyst layer (20), a second catalyst layer (30), and a third catalyst layer (40), wherein each catalyst layer extends from the upstream end of the first substrate (10A), the first catalyst layer (20) is composed of an upstream layer (21) and a downstream layer (22), the upstream layer (21) and the downstream layer (22) each contain Ce and Pd and / or Pt, the second catalyst layer (30) contains Rh and Ce, the third catalyst layer (40) contains Rh, V1, which is defined by the formula V1=M11 / M12, is not less than 0.10 but less than 1.00, and V2, which is defined by the formula V2=M3 / M2, is not less than 0 but less than 1.00.
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