ZEOLITE HAVING SPECIFIC RATIO OF DIVALENT COPPER IONS SUPPORTED THEREON, AND PREPARATION METHOD THEREFOR AND CATALYST COMPOSITION COMPRISING SAME

• US 20190322537A1
• Filed: 11/29/2017
• Published: 10/24/2019
• Est. Priority Date: 12/02/2016
• Status: Active Grant

• Current Assignee: Heesung Catalysts Corporation
• Original Assignee: Heesung Catalysts Corporation
• Inventors: Kim, Mi-young, Kim, Jin-won, Kim, Yong Sul, Kim, Eun-seok, Na, Seung Chul, Han, Hyun-sik
• Granted Patent: US 10,889,503 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 2255/20738 Iron
• CPC Class Codes: B01D 2255/20761 Copper
• CPC Class Codes: B01D 2255/50 Zeolites
• CPC Class Codes: B01D 53/9418 for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
• CPC Class Codes: B01J 2229/18 to introduce other elements into or onto the molecular sieve itself
• CPC Class Codes: B01J 2229/183 in framework positions
• CPC Class Codes: B01J 2229/186 not in framework positions
• CPC Class Codes: B01J 2229/30 After treatment, characterised by the means used
• CPC Class Codes: B01J 2229/42 Addition of matrix or binder particles
• CPC Class Codes: B01J 29/072 Iron group metals or copper
• CPC Class Codes: B01J 29/72 containing iron group metals, noble metals or copper
• CPC Class Codes: B01J 29/76 Iron group metals or copper
• CPC Class Codes: B01J 29/763 CHA-type, e.g. Chabazite, LZ-218
• CPC Class Codes: B01J 35/391 Physical properties of the active metal ingredient
• CPC Class Codes: B01J 35/394 Metal dispersion value, e.g. percentage or fraction
• CPC Class Codes: B01J 35/56 Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
• CPC Class Codes: B01J 37/0009 Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
• CPC Class Codes: B01J 37/0018 Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
• CPC Class Codes: B01J 37/0036 Grinding
• CPC Class Codes: B01J 37/0045 Drying a slurry, e.g. spray drying
• CPC Class Codes: B01J 37/038 : to form slurries or suspensions, e.g. a washcoat
• CPC Class Codes: B01J 37/04 : Mixing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/08 : Heat treatment B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: C01B 39/026 : After-treatment
• CPC Class Codes: C01B 39/06 : Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements , i.e. by direct or secondary synthesis
• CPC Class Codes: C01B 39/085 : Group IVB- metallosilicates
• CPC Class Codes: C01P 2002/72 : by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/80 : defined by measured data other than those specified in group C01P2002/70
• CPC Class Codes: C01P 2004/03 : obtained by SEM

Abstract

The present invention relates to zeolite containing Cu2+ (α) and Cu2+ (β) having different NO adsorption capacities loaded at a specific ratio, wherein the zeolite is chabazite (CHA)-type zeolite, particularly chabazite (CHA)-type zeolite loaded with divalent copper ions in which the NO adsorption area ratio of Cu2+ (α)/Cu2+ (β) after exposure to NO (nitrogen oxide) for 180 sec is 80% or more. In addition, the present invention relates to a method of preparing zeolite that is ion-exchanged in a slurry state and to a catalyst including the specified chabazite (CHA)-type zeolite.

Claims

1. A zeolite loaded with copper ions in which a Cu2+ (α

)/Cu2+ (β

) ratio after exposure to NO for 180 sec in a NO DRIFTS spectrum is 80% or more.

2. The zeolite of claim 1, wherein the zeolite is a chabazite (CHA)-type zeolite.

3. An SCR catalyst composition, comprising the zeolite of claim 1 and a binder.

4. The catalyst composition of claim 3, wherein the binder is zirconium acetate.

5. The catalyst composition of claim 3, further comprising an alkali metal and/or an alkaline earth metal.

6. The catalyst composition of claim 5, wherein the alkali metal is potassium and the alkaline earth metal is calcium.

7. A honeycomb SCR catalyst structure coated with the catalyst composition of claim 3.

8. A method of preparing the zeolite of claim 1, the method comprising preparing a zeolite slurry by dispersing a copper precursor and H-zeolite in a slurry state and drying and calcining the zeolite slurry.

9. The method of claim 8, wherein the copper precursor is copper oxide, copper nitrate, copper sulfate, or copper acetate.

10. The method of claim 8, wherein the H-zeolite is a chabazite (CHA)-type zeolite or an 8-membered oxygen-ring small-pore zeolite.

11. A method of preparing a Fe-ion-exchanged zeolite, the method comprising preparing a zeolite slurry by dispersing an iron precursor and H-zeolite in a slurry state and drying and calcining the zeolite slurry.

12. The method of claim 11, wherein the iron precursor is iron oxide, iron nitrate, iron sulfate, or iron acetate.