Catalyst and preparation method and application thereof

A catalyst and modification technology, applied in separation methods, chemical instruments and methods, mechanical equipment, etc., can solve problems such as poor adsorption performance, expensive palladium, and inability to meet HC purification requirements.

Active Publication Date: 2020-08-14
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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  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Embodiment 1: prepare the catalyzer that contains front stage part and rear stage part

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

[0137] The second support layer 200 includes Ag-β molecular sieve and Ce 60 Zr 30 Y 5 La 5 , Ag-β zeolite and Ce 60 Zr 30 Y 5 La 5 The mass ratio of the Ag-modified β molecular sieve is 9:1, 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 sieve is 3%; ...

Embodiment 2

[0155] Compared with Example 1, the only difference of Example 2 is that the catalyzer made in Example 2 only contains the latter stage part, and the catalyzer structure schematic diagram made is as follows figure 2 As shown, the metal honeycomb base 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 of 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 the mesh number 300cell / in 2 , Dimensions 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, which contains modified alumina and / or a modified beta molecular sieve. The modified beta molecular sieve is a beta molecularsieve modified by at least one of Ag, Fe, Pt or Rh; the molar ratio of SiO2 to Al2O3 in the modified beta molecular sieve is (150-200): 1. Specifically, the catalyst sequentially comprises 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 comprises an oxygen storage material and a modified beta molecular sieve; the third noble metal layer contains an oxygen storage material, platinum and / or rhodium and a modified beta molecular sieve, and platinum or rhodium is loaded in the modified beta molecular sieve;and the second noble metal layer contains an oxygen storage material, platinum, rhodium and modified aluminum oxide, the platinum is loaded in the oxygen storage material, and the rhodium is simultaneously loaded in the oxygen storage material and the modified aluminum oxide. The catalyst has long-lasting HC purification performance, meets the European V emission standard, and is particularly suitable for motorcycle tail gas purification treatment.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a catalyst and its preparation method and application. 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 standards and regulations. Compared with the previous Euro IV emission standards for motorcycles, the emission limits of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) in the Euro V emission standards are the Euro IV emission limits respectively. 87.7%, 26.3%, and 85.7%, among which HC has the largest decline. According to the previous experimental research, although the catalyst treatment tail 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 emission standards. Th...

Claims

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Application Information

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Patent Type & Authority Applications(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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