SCR catalyst and preparation method thereof

A kind of SCR catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problems of zeolite structure collapse, catalytic activity deterioration, etc., and achieve the effect of high thermal durability and excellent NOx purification performance

Pending Publication Date: 2022-05-06
HYUNDAI MOTOR CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the aluminum present in the zeolite framework is exposed to high-temperature water vapor, the aluminum can be leached from the framework, so the structure of the zeolite may collapse, resulting in poor catalytic activity

Method used

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  • SCR catalyst and preparation method thereof
  • SCR catalyst and preparation method thereof
  • SCR catalyst and preparation method thereof

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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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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/74B01J29/76B01J29/78B01J37/30B01J35/10B01D53/86B01D53/56B01D53/90
CPCB01J29/7065B01J29/743B01J29/763B01J29/783B01J37/30B01D53/8628B01J35/1023B01J35/1038B01D53/90B01J2229/186B01D2257/404B01D2258/01C01B39/48C01B39/026C01B39/023B01J29/072B01J37/08B01J35/002F01N3/2066B01D53/9418B01D2255/50B01J35/023
Inventor 尹达荣赵盛畯朴顺熙
Owner HYUNDAI MOTOR CO LTD
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