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A kind of catalyst and its preparation method and application

A catalyst and modification technology, applied in separation methods, chemical instruments and methods, mechanical equipment, etc., can solve problems such as failure to meet HC purification requirements, poor adsorption performance, expensive palladium, etc., achieve long-term HC purification performance, improve Fast ignition performance, good cost-effective effect

Active Publication Date: 2022-06-07
JIANGMEN DACHANGJIANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when purifying HC, it is often necessary to use HC adsorbents, such as zeolite, but the adsorption performance of zeolite on HC in the prior art is not good, which leads to the inability to meet the long-term HC purification requirements
Catalysts used in the prior art to treat motor vehicle exhaust often use expensive palladium, which is expensive

Method used

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  • A kind of catalyst and its preparation method and application
  • A kind of catalyst and its preparation method and application
  • A kind of catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Example 1: Preparation of a catalyst containing a pre-stage part and a post-stage part

[0136] A catalyst, structured as figure 1 As shown, it contains a front stage part and a rear stage part, and the rear stage part includes a metal (alloy of iron and aluminum) honeycomb matrix 100, a second carrier layer 200, a third noble metal layer 300, and a second noble metal layer 400 in sequence from bottom to top ; The front part includes metal honeycomb matrix 100, the first carrier layer 500, the first precious metal layer 600, the second precious metal layer 400 in sequence from bottom to top; the distance between the front part and the rear part can be 220mm.

[0137] The second carrier layer 200 includes Ag-β molecular sieve and Ce 60 Zr 30 Y 5 La 5 , Ag-β molecular sieve and Ce 60 Zr 30 Y 5 La 5 The mass ratio of 9:1, Ag-modified β molecular sieve in SiO 2 with Al 2 O 3 The molar ratio of Ag is 150:1, and the mass ratio of Ag in the modified β molecular siev...

Embodiment 2

[0155] Compared with Example 1, the only difference of Example 2 is that the catalyst prepared in Example 2 only contains the latter part, and the schematic diagram of the prepared catalyst structure is as follows: figure 2 As shown, the metal honeycomb matrix 100, the second carrier layer 200, the third noble metal layer 300, and the second noble metal layer 400 are sequentially included from bottom to top.

Embodiment 3

[0157] Compared with Example 1, the only difference in Example 3 is that the catalyst prepared in Example 3 only contains the latter part, and the specification of the metal honeycomb matrix of the latter part is 300 cells / in of pore mesh. 2 , Outer size Φ63mm (diameter) × 90 (core length), volume 0.263L.

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Abstract

The invention belongs to the field of catalysts and discloses a catalyst containing modified alumina and / or modified β molecular sieves; the modified β molecular sieves are β modified with at least one of Ag, Fe, Pt or Rh Molecular sieve; SiO in modified β molecular sieve 2 with Al 2 o 3 The molar ratio is (150‑200):1. Specifically, a catalyst includes a substrate, a second carrier layer, a third noble metal layer, and a second noble metal layer from bottom to top; the second carrier layer includes an oxygen storage material and a modified β molecular sieve; the third noble metal layer contains a storage Oxygen material, platinum and / or rhodium, modified beta molecular sieve, platinum or rhodium supported in modified beta molecular sieve; second noble metal layer containing oxygen storage material, platinum and rhodium, modified alumina, platinum supported in oxygen storage material , rhodium is simultaneously loaded in the oxygen storage material and the modified alumina. The catalyst has long-term HC purification performance, meets Euro V emission standards, and is especially suitable for motorcycle exhaust purification treatment.

Description

technical field [0001] The invention belongs to the field of catalysts, and particularly relates to a catalyst and a preparation method and application thereof. Background technique [0002] At present, domestic motorcycle exhaust emissions need to meet the National IV emission standards. On January 1, 2020, Europe began to implement the Euro V emission standard regulations. Compared with the previous motorcycle Euro IV emission standard, the emission limits of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) in the Euro V emission standard are the Euro IV emission limits respectively. 87.7%, 26.3%, and 85.7%, among which HC has the largest decline. Through preliminary experimental research, it is found that although the catalyst treatment exhaust gas in the current technology can meet the HC purification requirements in the Euro V emission standard at the beginning, it cannot purify HC for a long time. , cannot directly meet the requirements of Euro V emis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94B01D53/62B01D53/44B01D53/56B01J20/18B01J29/74B01J20/30
CPCB01D53/945B01J29/7415B01J20/186B01J20/08B01J2229/20Y02T10/12
Inventor 祝清超李建统代东辉黄江予
Owner JIANGMEN DACHANGJIANG GROUP CO LTD
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