SCR catalyst and preparation method thereof

Abstract

The present invention discloses a method for preparing a selective catalytic reduction (SCR) catalyst, the method comprising: a first step of preparing a synthesis mother liquor comprising a silica and alumina supply source comprising zeolite A and silica, a structure inducing material, a complexing material, and a solvent; a second step of reacting the synthesis mother liquor to prepare CHA zeolite; and a third step of performing ion exchange on the prepared CHA zeolite and a transition metal.

Description

[0001] Cross References to Related Applications

[0002] This application claims priority and benefit from Korean Patent Application No. 10-2020-0146180 filed with the Korean Intellectual Property Office on November 4, 2020, the entire contents of which are incorporated herein by reference. technical field

[0003] The present disclosure relates to an SCR catalyst and a preparation method thereof, and more particularly, to an SCR catalyst with improved thermal durability and NOx purification performance and a preparation method thereof. Background technique

[0004] Zeolite is a porous material with many pores of unique and regular shape and size.

[0005] The acidity of zeolites can be controlled in a wide range by changing the content of aluminum present in the framework, and zeolites have a large specific surface area and can exchange cations, so zeolites are widely used as catalysts or adsorbents in the field of fine chemistry.

[0006] Recently, a selective catalytic r...

Examples

preparation example Construction

[0035] A method for preparing an SCR (Selective Catalytic Reduction) catalyst according to an embodiment of the present disclosure includes: preparing a synthesis mother liquor including a supply source of silica and alumina including zeolite A and silica, a structure inducing material, a complex compounding materials and solvents; reacting the synthesis mother liquor to prepare CHA zeolite; and ion-exchanging the prepared CHA zeolite with a transition metal.

[0036] figure 1 is a process flow diagram illustrating a method for preparing an SCR catalyst according to an embodiment of the present disclosure. In the following, refer to figure 1 , the preparation method of the SCR catalyst is described.

[0037] Firstly, in step S1, a synthesis mother liquor comprising a supply source of silica and alumina, a structure-inducing material, a complexing material, and a solvent is prepared.

[0038] When zeolite A is used as a supply source of silica and alumina, a CHA zeolite havi...

Embodiment 1

[0064] CHA zeolite (CHA-2A) and copper ion-exchanged CHA zeolite (Cu / CHA-2A) were prepared in the same manner as in Comparative Example, except that a synthesis mother liquor was prepared using the composition shown in Table 1 below.

Embodiment 2

[0066] CHA zeolite (CHA-2B) and copper ion-exchanged CHA zeolite (Cu / CHA-2B) were prepared in the same manner as in Comparative Example, except that a synthetic mother liquor was prepared using the composition shown in Table 1 below.

[0067] Table 1

[0068]

[0069] 1) SDA: Trimethyladamantyl ammonium hydroxide (AdaOH)

[0001] Cross References to Related Applications

[0002] This application claims priority and benefit from Korean Patent Application No. 10-2020-0146180 filed with the Korean Intellectual Property Office on November 4, 2020, the entire contents of which are incorporated herein by reference. technical field

[0003] The present disclosure relates to an SCR catalyst and a preparation method thereof, and more particularly, to an SCR catalyst with improved thermal durability and NOx purification performance and a preparation method thereof. Background technique

[0004] Zeolite is a porous material with many pores of unique and regular shape and size.

[0005] The acidity of zeolites can be controlled in a wide range by changing the content of aluminum present in the framework, and zeolites have a large specific surface area and can exchange cations, so zeolites are widely used as catalysts or adsorbents in the field of fine chemistry.

[0006] Recently, a selective catalytic r...

Examples

preparation example Construction

[0035] A method for preparing an SCR (Selective Catalytic Reduction) catalyst according to an embodiment of the present disclosure includes: preparing a synthesis mother liquor including a supply source of silica and alumina including zeolite A and silica, a structure inducing material, a complex compounding materials and solvents; reacting the synthesis mother liquor to prepare CHA zeolite; and ion-exchanging the prepared CHA zeolite with a transition metal.

[0036] figure 1 is a process flow diagram illustrating a method for preparing an SCR catalyst according to an embodiment of the present disclosure. In the following, refer to figure 1 , the preparation method of the SCR catalyst is described.

[0037] Firstly, in step S1, a synthesis mother liquor comprising a supply source of silica and alumina, a structure-inducing material, a complexing material, and a solvent is prepared.

[0038] When zeolite A is used as a supply source of silica and alumina, a CHA zeolite havi...

Embodiment 1

[0064] CHA zeolite (CHA-2A) and copper ion-exchanged CHA zeolite (Cu / CHA-2A) were prepared in the same manner as in Comparative Example, except that a synthesis mother liquor was prepared using the composition shown in Table 1 below.

Embodiment 2

[0066] CHA zeolite (CHA-2B) and copper ion-exchanged CHA zeolite (Cu / CHA-2B) were prepared in the same manner as in Comparative Example, except that a synthetic mother liquor was prepared using the composition shown in Table 1 below.

[0067] Table 1

[0068]

[0069] 1) SDA: Trimethyladamantyl ammonium hydroxide (AdaOH)

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