High-temperature-resistant high-activity Cu-based SCR catalyst and preparation method thereof

A SCR catalyst, high activity technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of reducing selectivity, etc., to improve selectivity, widen the catalytic activity window, and low production cost Effect

Pending Publication Date: 2020-01-14
凯龙蓝烽新材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the Cu molecular sieve SCR catalyst prepared by the impregnation method, the Cu(II) ions exchanged with the molecular sieve framework are easy to migrate out of the pores, and are oxidized to CuO on the surface of the catalyst. CuO will promote the formation of N2O and NO2, thereby reducing the reaction to N 2 selectivity

Method used

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  • High-temperature-resistant high-activity Cu-based SCR catalyst and preparation method thereof
  • High-temperature-resistant high-activity Cu-based SCR catalyst and preparation method thereof

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preparation example Construction

[0036] In some illustrative embodiments, a method for preparing a high-temperature-resistant high-activity Cu-based SCR catalyst includes the following steps

[0037] S1: Preparation of highly dispersed nano-Cu solution;

[0038] S101: Take the nano-Cu source, add it to deionized water, prepare a 0.5-10% solution, and stir for 10-60 minutes; the nano-Cu source is nano-Cu particles, and its precursor is copper nitrate, copper acetate, copper sulfate, copper chloride one or more of them.

[0039] S102: According to the ratio of copper source dispersant to Cu molar ratio of 0.1-9, add copper source dispersant and stir for 10-60min; copper source dispersant is one or more of sugars, alcohols or esters. Sugars are sucrose, maltose, fructose, dextran and the like. Alcohols include polyvinyl alcohol, polyethylene glycol, glycerol, and the like. Esters are ethyl acetate, butyl acetate and the like.

[0040] S103: According to the molar ratio of metal M to Cu being 0.1-2, add metal...

Embodiment 1

[0068] A method for preparing a high-temperature resistant and highly active Cu / Zr-SSZ-13 molecular sieve SCR catalyst, the specific implementation steps are as follows:

[0069] Preparation of Highly Dispersed Nano-Cu Solution

[0070] a. Weigh 15.0 g of nano-Cu solution, add 600.0 g of deionized water, and stir for 20 min.

[0071] b. Add 30.0g sucrose and stir for 30min.

[0072] c. Add 4.29g of zirconium nitrate solution and stir for 20min.

[0073] d. Adjust the pH of the solution to 3.0 and stir for 30 minutes.

[0074] Preparation of Cu-molecular sieve in situ impregnation solution

[0075] a. Weigh 500g of SSZ-13 molecular sieve powder, slowly add it into the highly dispersed nano-Cu solution at a rate of 10g / min, keep stirring evenly, and stir for 90min until the molecular sieve is completely dispersed.

[0076] b. Add 0.8g acetylenic diol and stir for 60min.

[0077] c. Pass the prepared slurry into a sand mill, and grind for 40 minutes until the particle size D...

Embodiment 2

[0083] Embodiment 2: A kind of preparation method of Cu / Co-Beta molecular sieve SCR catalyst with high temperature resistance and high activity, the specific implementation steps are as follows:

[0084] Preparation of Highly Dispersed Nano-Cu Solution

[0085] a. Weigh 18.0 g of nano-Cu solution, add 600.0 g of deionized water, and stir for 10-60 min.

[0086] b. Add 30.0 g of sucrose and stir for 30 minutes.

[0087] c. Add 2.91g of cobalt nitrate solution and stir for 20min.

[0088] d. Adjust the pH of the solution to 3.0 and stir for 30 minutes.

[0089] Preparation of Cu-molecular sieve in situ impregnation solution

[0090] a. Weigh 600g of beta molecular sieve powder, slowly add it into the highly dispersed nano-Cu solution at a rate of 10g / min, keep stirring evenly, and stir for 90min until the molecular sieve is completely dispersed.

[0091] b. Add 0.8g acetylenic diol and stir for 30min.

[0092] c. Adjust the pH value of the solution to 5.8, the solid content...

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Abstract

The invention provides a high-temperature-resistant highly-activity Cu-based SCR catalyst and a preparation method thereof. The preparation method includes the steps that a highly dispersed nano Cu solution is prepared; a Cu-molecular sieve in-situ impregnation solution is prepared; and the Cu-based SCR catalyst using an in-situ impregnation method is prepared. In the method, the Cu molecular sieve SCR is doped with metal salt with an ion radius within 30% of copper ion, by optimizing the preparation process and ratio, a solid solution system is formed, the problem of Cu (II) ion migration issolved, the generation of a by-product N2O is suppressed, the selectivity of N2 is improved, the acid site strength of the catalyst is enhanced, the storage capacity of a catalyst NH3 is improved, a catalytic activity window of the catalyst is widened, and the requirements of national VI emission standards are met. Compared with the prior art, the preparation method is simple, the production costis low, the repeatability is high, the process control is easy to implement, and the practical application requirements can be met well.

Description

technical field [0001] The invention belongs to the field of catalysts and preparation methods thereof, in particular to a Cu-based SCR catalyst with high temperature resistance and high activity and a preparation method thereof. Background technique [0002] Selective catalytic reduction of NH3 is currently recognized as one of the most effective NOx purification technologies for diesel vehicle exhaust. The development of efficient, stable and environmentally friendly NH 3 -SCR catalyst is the common goal of automobile exhaust after-treatment enterprises and major research institutions. Cu-based zeolite catalysts due to their broad NH 3 -SCR reactivity window and excellent N 2 Selective, widely concerned. [0003] At present, there are still many problems in the Cu molecular sieve SCR catalyst technology used for NOx purification of diesel vehicles. Its catalytic activity is mainly in the low and medium temperature region, and the catalytic activity in the high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/94B01D53/56
CPCB01J29/763B01J29/7615B01D53/9418B01J2229/18Y02C20/10
Inventor 朱增赞汪银环赵磊冯峰孙敏任衍伦徐欢陈令伍郭晓会王菊
Owner 凯龙蓝烽新材料科技有限公司
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