Nox storage catalyst and method for preparing the same

Patent metadata

Field	Value
Publication number	US-12582974-B2
Application number	US-202418772490-A
Country	US
Kind code	B2
Filing date	Jul 15, 2024
Priority date	Nov 4, 2020
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A NO X storage catalyst includes CHA zeolite, a transition metal ion-exchanged in the CHA zeolite, and a rare earth metal that is different the transition metal and is supported on the CHA zeolite. A method for preparing a NO X storage catalyst includes preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, reacting the synthetic mother liquid to prepare a CHA zeolite, and supporting a transition metal and a rare earth metal that is different from the transition metal on the prepared CHA zeolite.

First claim

What is claimed is:

1 . A NO X storage catalyst comprising:
CHA zeolite; a transition metal ion-exchanged in the CHA zeolite; and a rare earth metal that is different from the transition metal and is supported on the CHA zeolite; wherein the transition metal consists essentially of Cu; wherein the rare earth metal consists essentially of La; wherein the NO X storage catalyst comprises about 16 wt % to about 30 wt % of the La based on a total weight of the NO X storage catalyst; and wherein the NO X storage catalyst comprises about 1.5 wt % to about 3 wt % of the Cu based on the total weight of the NO X storage catalyst.

2 . The NO X storage catalyst of claim 1 , wherein the CHA zeolite is aluminosilicate zeolite.

3 . The NO X storage catalyst of claim 1 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

4 . The NO X storage catalyst of claim 1 , wherein the transition metal consists of Cu and wherein the rare earth metal consists of La.

5 . A NO X storage catalyst comprising:
CHA zeolite; a transition metal ion-exchanged in the CHA zeolite; and a rare earth metal that is different from the transition metal and is supported on the CHA zeolite; wherein the transition metal consists essentially of Cu; wherein the rare earth metal consists essentially of Ce; wherein the NO X storage catalyst comprises about 16 wt % to about 30 wt % of the Ce based on a total weight of the NO X storage catalyst; and wherein the NO X storage catalyst comprises about 1.9 wt % to about 3 wt % of the Cu based on the total weight of the NO X storage catalyst.

6 . The NO X storage catalyst of claim 5 , wherein the CHA zeolite is aluminosilicate zeolite.

7 . The NO X storage catalyst of claim 6 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

8 . The NO X storage catalyst of claim 6 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

9 . The NO X storage catalyst of claim 5 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

10 . A NO X storage catalyst comprising:
CHA zeolite; Cu ion-exchanged in the CHA zeolite, wherein the NOX storage catalyst comprises about 1.5 wt % to about 3 wt % of the Cu based on a total weight of the NOX storage catalyst; and a rare earth metal supported on the CHA zeolite, wherein the rare earth metal consists essentially of La such that the NO X storage catalyst comprises about 16 wt % to about 30 wt % of the La based on the total weight of the NO X storage catalyst or wherein the rare earth metal consists essentially of Ce such that the NO X storage catalyst comprises about 16 wt % to about 30 wt % of the Ce based on the total weight of the NO X storage catalyst; wherein the NO X storage catalyst exhibits physical properties resulting from having been prepared by a method comprising:
preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, wherein the structure-inducing material comprises benzyl trimethyl ammonium chloride;
reacting the synthetic mother liquid to prepare the CHA zeolite; and
supporting the Cu and the rare earth metal on the prepared CHA zeolite.

11 . The NO X storage catalyst of claim 10 , wherein the CHA zeolite is aluminosilicate zeolite.

12 . The NO X storage catalyst of claim 11 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

13 . The NO X storage catalyst of claim 10 , wherein the CHA zeolite has a Si/Al mole ratio of about 1 to about 50.

14 . The NO X storage catalyst of claim 10 , wherein the zeolite raw material comprises a zeolite Y.

15 . The NO X storage catalyst of claim 10 , wherein the zeolite raw material comprises an ultra-stable zeolite Y (zeolite USY).

16 . The NO X storage catalyst of claim 10 , wherein the zeolite raw material has a SiO 2 /Al 2 O 3 mole ratio of about 5 to about 100.

17 . The NO X storage catalyst of claim 11 , wherein the synthetic mother liquid comprises about 0.1 parts by mole to about 0.4 parts by mole of the structure-inducing material and about 0.1 parts by mole to about 0.4 parts by mole of the complexing material based on 1 part by mole of the source of silica and the alumina.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Univ Nat Chonnam Ind Found

Inventors

• Yoon Dalyoung
• Park Soon Hee
• Cho Sung June

Classifications

• B01J35/19

  Catalysts containing parts with different compositions · CPC title

• F01N3/0842

  Nitrogen oxides · CPC title

• B01J29/7065 Primary

  CHA-type, e.g. Chabazite, LZ-218 · CPC title

• C01B39/48

  using at least one organic template directing agent · CPC title

• B01J23/83

  with rare earths or actinides · CPC title