Synthesis of a catalyst for the selective reduction of NOx comprising IZM-10 AEI zeolite and at least one transition metal

By directly preparing catalysts based on IZM-10 zeolite and transition metals with an AEI framework, the problems of high ignition temperature and large N2O emissions in existing technologies were solved, achieving efficient selective NOx reduction, simplifying the preparation process and improving catalyst stability.

CN122374255APending Publication Date: 2026-07-10IFP ENERGIES NOUVELLES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IFP ENERGIES NOUVELLES
Filing Date
2024-12-04
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies for preparing catalysts for the selective catalytic reduction of NOx suffer from problems such as high ignition temperature and high nitrogen oxide (N2O) emissions, and require additional ion exchange steps, which affect efficiency and stability.

Method used

By directly preparing catalysts based on the AEI framework type IZM-10 zeolite and transition metals, the ammonium nitrate ion exchange step is omitted. Specific synthesis methods, including hydrothermal treatment and calcination, are used to ensure good exchange of transition metals, resulting in high thermal and hydrothermal stability.

Benefits of technology

The catalyst achieved NOx conversion performance with low ignition temperature and low N2O emissions, exhibiting significant NOx conversion effect, while simplifying the preparation process and improving catalyst stability.

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Abstract

This invention relates to a catalyst for the selective reduction of NOx, said catalyst being based on IZM-10 AEI zeolite and at least one transition metal, and a method for its preparation, said method comprising at least mixing the following substances in an aqueous medium: FAU-type zeolite, whose SiO2... 2(FAU) / Al2O 3(FAU) The process involves: ii) a molar ratio of 10 to 60 (inclusive) and less than 0.005% by mass of sodium in cationic form, a nitrogen-containing organic compound R (wherein R is (6R,10S)-6,10-dimethyl-5-aza-onium spiro[4,5]decane in hydroxide form), and optionally sodium hydroxide, until a homogeneous precursor gel is obtained; iii) a hydrothermal treatment step; iii) a step of at least one ion exchange with a solution containing at least one substance capable of releasing a transition metal; and iv) a heat treatment step by drying and calcination.
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Citation Information

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