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SCR catalyst containing copper and iron composite bases and preparation method of SCR catalyst

A technology of SCR catalyst and composite base, applied in the field of chemistry, can solve the problem of low activity, and achieve the effect of excellent catalyst performance and cost reduction

Inactive Publication Date: 2015-05-13
清华大学苏州汽车研究院(吴江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect that the SCR catalyst using the synthetic zeolite carrying iron in the prior art has low activity at low temperature after the hydrothermal durability test and the sulfur oxide durability test, and to provide a Copper-iron composite-based SCR catalyst with high activity at low temperature after hydrothermal durability test and sulfur oxide durability test and preparation method thereof

Method used

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  • SCR catalyst containing copper and iron composite bases and preparation method of SCR catalyst
  • SCR catalyst containing copper and iron composite bases and preparation method of SCR catalyst
  • SCR catalyst containing copper and iron composite bases and preparation method of SCR catalyst

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preparation example Construction

[0060] In the synthetic zeolite with porous structure used for the preparation of the SCR catalyst, copper (II) ions and iron (III) ions can be monodispersed in the framework. Considering the hydrothermal durability as a catalyst, the maximum number of oxygen rings Taking 8 is suitable, from copper (II) ions and iron (III) ions as catalysts, it has the ability to change from NO to NO. 2 From the viewpoint of an oxidation reaction site for selective contact reduction, it is preferable to have a three-dimensional structure. From the viewpoint of high ammonia adsorption performance as a reducing agent, the above-mentioned synthetic zeolite after hydrogenation is used without particular limitation.

[0061] The synthetic zeolite in the preparation of the SCR catalyst of the present invention can be distinguished by the structure code of the International Zeolite Association, such as CHA type (for example, SSZ-13 with a maximum number of oxygen rings of 8) aluminum silicate series ...

Embodiment 1

[0097] Hydrogenated CHA-type Synthetic Zeolite Supporting Copper(Ⅱ) Ions and Iron(Ⅲ) Ions

[0098] Example 1 A hydrogenated CHA-type synthetic zeolite was obtained by using a silicoaluminophosphate-based CHA-type synthetic zeolite to support copper (II) ions and iron (III) ions.

[0099] Adjustment of zeolite raw materials

[0100] First, ion-exchanged water and 85 wt % orthophosphoric acid were stirred and mixed uniformly in a glass container. Further, pseudo-boehmite (Pural SB) was added, and the mixture was stirred at room temperature for 20 minutes.

[0101] Next, morpholine was gradually added with stirring, and the mixture was kept at room temperature for 1 hour.

[0102] Thereafter, colloidal silica (Ludox AS40) was added, and stirring was continued for 5 minutes to obtain a suspension having a pH of 8.1, which was 1.0 (Al 2 O 3 ): 1.06(P 2 O 5 ): 1.08 (SiO 2 ): 2.09(R): 66(H 2 O) composition.

[0103] hydrothermal synthesis

[0104] The obtained suspension wa...

Embodiment 2

[0112] Example 2 is the same as Example 1 except that the degassing treatment is not carried out, and the hydrogenated CHA type synthetic zeolite supporting copper (II) ions and iron (III) ions is used as the SCR catalyst. The ratio (mass / volume percent concentration) of the mass of the hydrogenated synthetic zeolite crystal to the volume of the nitric acid aqueous solution containing copper (II) ions and iron (III) ions is 175%. The average particle diameter (D50) of the obtained SCR catalyst was 7 μm. According to the ICP analysis results, the contents of copper (II) ions and iron (III) ions were 2.5 wt % and 2.5 wt %, respectively. That is, the mass ratio of Cu and Fe contained in the SCR catalyst is 1:1, and the total content of Cu and Fe is 5 wt %.

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Abstract

The invention discloses an SCR catalyst containing synthetized zeolite and copper-iron composite bases, in particular an SCR catalyst which still has a NOx purification property in a low-temperature region after an aquathermal durability test and a sulfur oxide durability test. The preparation method of the SCR catalyst disclosed by the invention comprises the step of concocting a hydrogenated synthetized zeolite crystal with an aqueous solution through a mixing working procedure, wherein the largest oxygen ring number of the hydrogenated synthetized zeolite crystal is 8, and the hydrogenated synthetized zeolite crystal has a three-dimensional structure; the pH value of the aqueous solution is 0.1-0.7, and the aqueous solution contains copper (II) ions and iron (III) ions; a filtration working procedure and a cleaning working procedure are not needed.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to an SCR catalyst, in particular to a method for preparing a copper-iron composite-based SCR catalyst composed of hydrogenated zeolite crystals containing copper (II) ions and iron (III) ions. In the presence of ammonia and ammonia derivatives (such as cyanic acid, etc.) reducing agents obtained by thermal hydrolysis of urea, it is used to purify NOx in automobile exhaust. Background technique [0002] The urea water mist is injected by the diesel vehicle exhaust gas treatment device, and the ammonia obtained by the hydrolysis of the urea is used as the reducing agent, and the SCR catalyst is used as the NOx selective reduction catalyst (usually referred to as the selective contact reduction of the SCR catalyst "Selective Catalytic Reduction"). Abbreviation) The carrier used is known to include synthetic zeolite with high adsorption capacity of solid acid point ammonia. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/85B01J32/00B01D53/56B01D53/94
Inventor 帅石金北村武昭松冈宽胡准华伦清水大辅
Owner 清华大学苏州汽车研究院(吴江)
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