Selective catalytic reduction catalyst, and method for preparing a selective catalytic reduction catalyst.

The method of coating a substrate with a sequence of iron and copper-containing zeolite materials enhances SCR catalyst performance by reducing N2O emissions while maintaining high NOx conversion rates, overcoming the limitations of existing catalysts.

JP7864637B2Active Publication Date: 2026-05-25BASF MOBILE EMISSIONS CATALYSTS LLC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
BASF MOBILE EMISSIONS CATALYSTS LLC
Filing Date
2021-03-30
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Existing SCR catalysts struggle to maintain high NOx conversion rates while significantly reducing N2O emissions, especially under standard and high-speed SCR gas supply conditions.

Method used

A method involving a coating of iron and copper-containing zeolite material applied on the inner wall of a substrate, where a copper-containing zeolite material is fired first over a specific axial length, followed by an iron-containing zeolite material in a controlled sequence, optimizing the catalyst's structure for enhanced performance.

Benefits of technology

The method achieves significant reduction in N2O emissions while maintaining or improving NOx conversion rates, addressing the limitations of existing catalysts under varying gas supply conditions.

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Abstract

The present invention relates to a method for preparing a catalyst for the selective catalytic reduction of nitrogen oxides, the method comprising, among other steps, preparing a second aqueous mixture comprising water and an iron salt, and disposing the second aqueous mixture on the substrate obtained according to step (ii) over y% (y in the range of 10 to x) of the axial length of the substrate from the inlet end to the outlet end of the substrate to obtain a coating comprising a zeolite material containing copper and an iron salt over y% of the axial length of the substrate in a first zone; and, if x>y, obtaining a substrate comprising a coating comprising a zeolite material containing copper in a second zone extending from y% to x% of the axial length of the substrate from the inlet end to the outlet end.
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Citation Information

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