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Catalyst for diesel engine based on modified hydrotalcite-derived oxide and preparation method thereof

A technology for modifying water and catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as poor adsorption capacity, reduced storage active sites, and deteriorating purification performance

Active Publication Date: 2021-10-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, γ-Al 2 o 3 The LNT catalytic activity of the material itself and the NO X Poor adsorption capacity, meanwhile, at high temperature γ-Al 2 o 3 It is also easy to undergo phase transition or react with BaO to form BaAl with spinel structure 2 o 4 , resulting in NO X The storage active sites are reduced, which deteriorates the NOx purification performance of the LNT catalyst

Method used

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  • Catalyst for diesel engine based on modified hydrotalcite-derived oxide and preparation method thereof
  • Catalyst for diesel engine based on modified hydrotalcite-derived oxide and preparation method thereof
  • Catalyst for diesel engine based on modified hydrotalcite-derived oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Determination of the amount of catalyst raw material used

[0053] The mass ratio of main catalyst noble metal Pt and Pd quality sum and Cu-Fe bimetallic modified ZSM-5 type molecular sieve in the catalyst prepared in Design Example 1 is: 2%:98%; Cu-Fe bimetallic modified ZSM- CuO, Fe in type 5 molecular sieve 2 o 3The mass ratio of the ZSM-5 molecular sieve is: 15%:10%:75%; the mass ratio of the noble metal Pt to Pd is: 50%:50%; the CeO in the cocatalyst 2 , ZrO 2 The mass ratio is: 80%:20%; La-Zn bimetallic modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio is: 90%:10%; in the La-Zn bimetallic modified hydrotalcite derived composite oxide 2 o 3 and Al 2 o 3 The mol ratio of ZnO and MgO is: 80%:20%; the mol ratio of ZnO and MgO is: 50%:50%; the mass ratio of main catalyst, adsorbent, co-catalyst and coating base material is: 10%:10%:10 %: 70%; Every 100g catalytic coating needs 15g average molecular wei...

Embodiment 2

[0064] (1) Determination of the amount of catalyst raw material used

[0065] The mass ratio of the sum of the main catalyst noble metal Pt and Pd quality and the Cu-Fe bimetallic modified ZSM-5 type molecular sieve in the prepared catalyst of Design Example 2 is: 5%:95%; Cu-Fe bimetallic modified ZSM- CuO, Fe in type 5 molecular sieve 2 o 3 The mass ratio of the ZSM-5 molecular sieve is: 5%:5%:90%; the mass ratio of the noble metal Pt to Pd is: 25%:75%; the CeO in the cocatalyst 2 , ZrO 2 The mass ratio is: 50%:50%; La-Zn bimetallic modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio is: 75%:25%; in the La-Zn bimetallic modified hydrotalcite derived composite oxide 2 o 3 and Al 2 o 3 The mol ratio of ZnO and MgO is: 50%:50%; the mol ratio of ZnO and MgO is: 75%:25%; the mass ratio of main catalyst, adsorbent, co-catalyst and coating base material is: 10%:10%:10 %: 70%; Every 100g catalytic coating needs 15g average...

Embodiment 3

[0076] (1) Determination of the amount of catalyst raw material used

[0077] The mass ratio of main catalyst noble metal Pt and Pd quality sum and Cu-Fe bimetallic modified ZSM-5 type molecular sieve in the prepared catalyst of Design Example 3 is: 5%:95%; Cu-Fe bimetallic modified ZSM- CuO, Fe in type 5 molecular sieve 2 o 3 The mass ratio of the ZSM-5 molecular sieve is: 15%:10%:75%; the mass ratio of the noble metal Pt to Pd is: 50%:50%; the CeO in the cocatalyst 2 , ZrO 2 The mass ratio is: 80%:20%; La-Zn bimetallic modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio is: 90%:10%; in the La-Zn bimetallic modified hydrotalcite derived composite oxide 2 o 3 and Al 2 o 3 The mol ratio of ZnO and MgO is: 80%:20%; the mol ratio of ZnO and MgO is: 75%:25%; the mass ratio of main catalyst, adsorbent, co-catalyst and coating base material is: 10%:10%:10 %: 70%; Every 100g catalytic coating needs 5g average molecular wei...

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Abstract

The invention discloses a catalyst for diesel engines based on modified hydrotalcite-derived oxides, using bimetallic modified ZSM‑5 molecular sieves and precious metals as the main catalyst; BaO as the adsorbent; CeO 2 -ZrO 2 as co-catalyst; bimetallic modified hydrotalcite-derived oxide and γ‑Al 2 o 3 It is the base material of the coating; the cordierite honeycomb ceramic is the carrier. The preparation process includes: determination of raw material consumption; preparation of modified ZSM-5 molecular sieve, modified hydrotalcite-derived composite oxide, and preparation and coating of coating slurry. The catalyst can efficiently catalyze the adsorption-reduction reaction of NOx in the exhaust gas through the cycle change of the lean / rich fuel operating conditions of the diesel engine. Modified molecular sieve partially replaces noble metal in LNT catalyst, reduces raw material cost, improves sulfur resistance and heat resistance performance; modified hydrotalcite-derived oxide replaces γ‑Al in LNT catalyst 2 o 3 , improve the NOx adsorption capacity of the catalyst.

Description

technical field [0001] The invention belongs to diesel vehicle tail gas pollutant purification technology, in particular to a catalyst for adsorption-reduction purification of nitrogen oxides (Nitrogen Oxides—NOx) pollutants in diesel vehicle tail gas and a preparation method thereof. Background technique [0002] NOx is a kind of air pollutant with great harm. It not only has a direct toxic effect on organisms, but also is one of the important causes of disasters such as photochemical smog, acid rain, and greenhouse effect. With the rapid growth of my country's motor vehicle production and ownership, the contribution rate of NOx emissions from the transportation industry has increased year by year, especially in urban areas. In recent years, the contribution rate of NOx emissions from motor vehicle exhaust has exceeded 50%. In motor vehicles, the NOx emissions of diesel vehicles will be relatively high. In 2017, 70% of the total NOx emissions of motor vehicles are emitted b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J20/04B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J20/041B01J29/46
Inventor 吕刚朱越宋崇林李亚松张荣鑫
Owner TIANJIN UNIV