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Double-coated catalyst for diesel engine based on hydrotalcite-derived oxide and preparation method

A hydrotalcite and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It can improve the NOx adsorption capacity, optimize the NOx adsorption performance, and improve the effect

Active Publication Date: 2021-11-02
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 catalyst is not the same, and the components of the exhaust gas it treats are also different. Uniform coating Layers lead to underdistribution of functional components at some depths and excess distribution of functional components at some depths

Method used

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  • Double-coated catalyst for diesel engine based on hydrotalcite-derived oxide and preparation method
  • Double-coated catalyst for diesel engine based on hydrotalcite-derived oxide and preparation method
  • Double-coated catalyst for diesel engine based on hydrotalcite-derived oxide and preparation method

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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-coated catalyst for diesel engines based on hydrotalcite-derived oxides and a preparation method. The outer coating contains Pt and perovskite main active components; BaO adsorbent; Ce‑Zr cocatalyst; hydrotalcite-derived oxide and γ‑Al 2 o 3 Coating base material; inner coating contains perovskite main active ingredient; BaO adsorbent; Ce‑Zr cocatalyst; hydrotalcite derived oxide, γ‑Al 2 o 3 and SiO 2 coating base materials; and cordierite honeycomb ceramic supports. The preparation process includes: catalyst composition design; preparation of perovskite and hydrotalcite derived oxides and coating of inner and outer catalytic coatings. The catalyst can efficiently catalyze the adsorption-reduction purification reaction of NOx in the exhaust gas through the cycle change of the lean / rich fuel operating conditions of the diesel engine. The non-uniform double coating preparation method is used to optimize the distribution characteristics of functional materials, reduce the cost of raw materials, and improve the NOx purification effect and durability.

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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Patent Type & Authority Patents(China)
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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