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Method for improving catalytic activity of denitration catalyst

A denitrification catalyst, high catalytic activity technology, applied in the field of denitrification catalysis, can solve the problems of stability gap, large pore structure, catalyst deactivation, etc., to prevent the entry of hydrocarbon molecules, improve catalytic stability and catalyst life, Effect of suppressing carbon deposition

Inactive Publication Date: 2017-12-29
安徽纳蓝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the relatively large pore structure of the above-mentioned molecular sieves (ten-membered ring or twelve-membered ring), hydrocarbons (HC) in motor vehicle exhaust can enter the micropore channels and react at the catalytic sites to form carbon deposits, thereby It leads to catalyst deactivation, and its stability is still far behind that of iron-based or copper-based SSZ-13 (CHA type) small-pore molecular sieves (with eight-membered ring channels).

Method used

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  • Method for improving catalytic activity of denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for improving the catalytic activity of a denitration catalyst, comprising the steps of:

[0028] S1. Add copper-based ZSM-5 molecular sieve to n-hexane, then add tetraethyl orthosilicate and stir evenly. The mass-volume ratio (g / mL) of copper-based ZSM-5 molecular sieve to tetraethyl orthosilicate is 1:0.15. The volume ratio of n-hexane to tetraethyl orthosilicate is 25:0.15, reflux in a water bath at 90°C for 1 hour, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 4 hours to obtain the first material;

[0029] S2. Add the first material to n-hexane, then add orthosilicate ethyl ester and stir evenly. The mass volume ratio (g / mL) of the first material to orthosilicate ethyl ester is 1:0.15, n-hexane and orthosilicate The volume ratio of ethyl ester is 25:0.15, reflux in a water bath at 90°C for 1 hour, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 4 hours to obtain the second material;

[0030] S3, repeating S...

Embodiment 2

[0032] A method for improving the catalytic activity of a denitration catalyst, comprising the steps of:

[0033] S1. Add copper-based ZSM-5 molecular sieve to n-hexane, then add tetraethyl orthosilicate and stir evenly. The mass-volume ratio (g / mL) of copper-based ZSM-5 molecular sieve to tetraethyl orthosilicate is 1:0.18. The volume ratio of n-hexane to tetraethyl orthosilicate is 20:0.18, reflux in a water bath at 90°C for 1 hour, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 4 hours to obtain the first material;

[0034] S2. Add the first material to n-hexane, then add orthosilicate ethyl ester and stir evenly. The mass volume ratio (g / mL) of the first material to orthosilicate ethyl ester is 1:0.18, n-hexane and orthosilicate The volume ratio of ethyl ester is 20:0.18, reflux in a water bath at 90°C for 1h, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 4h to obtain the second material;

[0035] S3, repeating S2 until t...

Embodiment 3

[0037] A method for improving the catalytic activity of a denitration catalyst, comprising the steps of:

[0038] S1. Add copper-based ZSM-5 molecular sieve to n-hexane, then add tetraethyl orthosilicate and stir evenly. The mass-volume ratio (g / mL) of copper-based ZSM-5 molecular sieve to tetraethyl orthosilicate is 1:0.16. The volume ratio of n-hexane to tetraethyl orthosilicate is 25:0.18, reflux in a water bath at 90°C for 1 hour, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 5 hours to obtain the first material;

[0039] S2. Add the first material to n-hexane, then add tetraethyl orthosilicate and stir evenly, the mass volume ratio (g / mL) of the first material to orthosilicate ethyl ester is 1:0.16, n-hexane and orthosilicate The volume ratio of ethyl ester is 25:0.18, reflux in a water bath at 90°C for 1h, filter, dry the filter cake, and roast in a muffle furnace at 500°C for 5h to obtain the second material;

[0040] S3, repeating S2 until th...

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Abstract

The invention discloses a method for improving catalytic activity of a denitration catalyst. The method comprises the steps as follows: the denitration catalyst is added to an organic solution, tetraethyl orthosilicate is added, the mixture is uniformly stirred, water bath reflux and filtration are performed, a filter cake is dried and calcined, and the denitration catalyst with high catalytic activity is obtained. The invention further discloses the denitration catalyst with high catalytic activity, which is prepared with the method for improving the catalytic activity of the denitration catalyst. The invention further discloses an application of the denitration catalyst with high catalytic activity in movable or fixed denitration equipment as a catalyst. Micromolecular NOx passes preferentially and selectively by controlling the size of pores of a molecular sieve, catalytic reactions occur at active sites in pores, the condition that macromolecular hydrocarbon enters the pore to form carbon deposition is effectively prevented, catalyst deactivation is prevented, thus, the catalytic activity and catalytic stability of the catalyst are improved, and the catalytic life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of denitration catalysis, in particular to a method for improving the catalytic activity of a denitration catalyst. Background technique [0002] NO x -SCR technology to deal with stationary or mobile source NO x In the process, the most widely used commercial catalyst system is the vanadium-titanium based system (V 2 o 5 -WO 3 / TiO 2 with V 2 o 5 -MoO 3 / TiO 2 ) such as patents CN101428215 and CN101396655. Compared with the well-applied vanadium-titanium-based catalysts, low-temperature denitrification catalysts are more researched today. CN101721993A discloses Mn and Ce-based oxide doped catalysts for low-temperature SCR denitrification, but this type of catalyst has poor low-temperature effect, and the preparation The process is complicated and the production cost is high. [0003] Beta (BEA-type topology) zeolite molecular sieve is the only high-silica zeolite with three-dimensional twelve-mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J33/00B01D53/86B01D53/56
Inventor 李超范炜田炜赵长艳
Owner 安徽纳蓝环保科技有限公司
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