Double-coating catalyst for diesel engine on basis of modified hydrotalcite-derived oxide and preparation method

A technology of hydrotalcite and oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of different, different exhaust components, functional components underdistribution etc.

Active Publication Date: 2019-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional LNT catalyst adopts the method of coating the same coating slurry multiple times to prepare the catalytic coating. This method is simple in process, but the function of the coating at different depths of the LNT cat...

Method used

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  • Double-coating catalyst for diesel engine on basis of modified hydrotalcite-derived oxide and preparation method
  • Double-coating catalyst for diesel engine on basis of modified hydrotalcite-derived oxide and preparation method
  • Double-coating catalyst for diesel engine on basis of modified hydrotalcite-derived oxide and preparation method

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Experimental program
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Effect test

Embodiment 1

[0056] (1) Catalyst composition design

[0057] The main active components of Pt and La in the outer catalytic coating were designed respectively. x Sr (1-x) mn y co (1-y) o 3 The mass percentage of the type perovskite composite oxide is: 2% / 98%; the mass percentage of the main active component of the outer catalytic coating, the outer catalytic coating adsorbent, the outer catalytic coating co-catalyst and the outer catalytic coating base material is : 15% / 10% / 10% / 65%; Bi-Ni bimetallic modified hydrotalcite-derived composite oxide, γ-Al in the base material of the inner catalytic coating 2 o 3 and SiO 2 The mass percentage of the inner catalytic coating is: 85% / 10% / 5%; the mass percentage of the main active ingredient of the inner catalytic coating, the inner catalytic coating adsorbent, the inner catalytic coating co-catalyst and the inner catalytic coating base material is: 10% / 10% / 10% / 70%; La x Sr (1-x) mn y co (1-y) o 3 The molar percentage of La ion and Sr i...

Embodiment 2

[0067] (1) Catalyst composition design

[0068] The main active components of Pt and La in the outer catalytic coating were designed respectively. x Sr (1-x) mn y co (1-y) o 3 The mass percentage of the type perovskite composite oxide is: 5% / 95%; the mass percentage of the main active component of the outer catalytic coating, the outer catalytic coating adsorbent, the outer catalytic coating co-catalyst and the outer catalytic coating base material is : 10% / 10% / 5% / 75%. Bi-Ni Bimetallic Modified Hydrotalcite-Derived Composite Oxide, γ-Al in Basic Material of Internal Catalytic Coating 2 o 3 and SiO 2 The mass percentage of the inner catalytic coating is: 80% / 10% / 10%; the mass percentage of the main active ingredient of the inner catalytic coating, the inner catalytic coating adsorbent, the inner catalytic coating co-catalyst and the inner catalytic coating base material is: 5% / 10% / 5% / 80%. La x Sr (1-x) mn y co (1-y) o 3 The molar percentage of La ion and Sr ion i...

Embodiment 3

[0078] (1) Catalyst composition design

[0079] The main active components of Pt and La in the outer catalytic coating were designed respectively. x Sr (1-x) mn y co (1-y) o 3 The mass percentage of the type perovskite composite oxide is: 5% / 95%; the mass percentage of the main active component of the outer catalytic coating, the outer catalytic coating adsorbent, the outer catalytic coating co-catalyst and the outer catalytic coating base material is : 15% / 10% / 5% / 70%; Bi-Ni bimetallic modified hydrotalcite-derived composite oxide, γ-Al in the base material of the inner catalytic coating 2 o 3 and SiO 2The mass percentage of the inner catalytic coating is: 85% / 10% / 5%; the mass percentage of the main active ingredient of the inner catalytic coating, the inner catalytic coating adsorbent, the inner catalytic coating co-catalyst and the inner catalytic coating base material is: 10% / 10% / 10% / 70%; La x Sr (1-x) mn y co (1-y) o 3 The molar percentage of La ion and Sr ion...

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Abstract

The invention discloses a double-coating catalyst for a diesel engine on the basis of a modified hydrotalcite-derived oxide and a preparation method. The double-coating catalyst is characterized in that an outer coating contains PT and perovskite as main active components, BaO as an absorbent, CeO2-ZrO2 as a cocatalyst, and the hydrotalcite-derived oxide and gamma-Al2O3 as basic materials of the coating; an inner layer contains perovskite as a main active component, BaO as an absorbent, CeO2-ZrO2 as a cocatalyst, and the hydrotalcite-derived oxide, gamma-Al2O3 and SiO2 as basic materials of the coating; and cordierite honeycomb ceramic is adopted as a catalyst carrier. A preparation process comprises the following steps of: design of composition of the catalyst; preparation of the perovskite and the hydrotalcite-derived oxide, and coating of inner and outer catalytic coatings. The double-coating catalyst and the preparation process disclosed by the invention have the beneficial effectsthat by cyclic change of lean/rich condition of the diesel engine, the catalyst can catalyze adsorbing-reducing purifying reaction of NOx in exhaust by high efficiency; by adoption of the nonuniformdouble-coating preparation method, the distribution characteristics of functional materials are optimized, the cost of the raw materials is reduced and the NOx purifying effect and the durability areimproved.

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] Lean NOx trapping (Lean NOx Trap—LNT) technology is currently one of the most effective methods for controlling NOx emissions from medium and small diesel engines, and has a high NOx X The conversion efficiency is to ensure that the diesel engine NO X It is one of the most potential exhaust after-treatment technologies that meet Euro V and Euro VI emission regulations. The LNT technology can effectively remove NOx in the exhaust gas by controlling the diesel engine to alternately run lean-burn and rich-burn operating conditions under the action of a special adsorption-reduction catalyst. A typical catalyst for LNT technology (referred to as LNT catalyst) is Pt / Ba...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J20/04B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J20/041B01J23/002B01J23/8986
Inventor 吕刚朱越宋崇林李亚松张荣鑫
Owner TIANJIN UNIV
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