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End hardening processing method for SCR denitration catalyst

A denitration catalyst and hardening treatment technology, applied in catalyst activation/preparation, catalyst protection, chemical instruments and methods, etc., can solve the problems of high dust and heavy metal concentration, shortened catalyst service life, harsh flue gas environmental conditions, etc. The effect of improving the service life and end hardness

Active Publication Date: 2014-09-10
罗浩斯环保设备(上海)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the country's control on nitrogen oxide emissions becomes more stringent, the amount of nitrogen oxides emitted into the atmosphere by stationary sources such as coal-fired boilers will be more and more strictly controlled. It is no longer possible to rely solely on low-nitrogen combustion technology. Meet strict emission standards
[0003] At present, the most widely used is the SCR denitrification catalyst. The flue gas environment in which it is located is relatively harsh, and the concentration of dust and heavy metals is high. The catalyst is severely washed out, and the catalyst is relatively easy to be worn and blocked, which greatly shortens the service life of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0014] A kind of end hardening treatment method of SCR denitration catalyst, its specific steps are as follows:

[0015] (1) Prepare the active solution: weigh 10g ammonium metatungstate, 5g cerium nitrate, and 15g ammonium heptamolybdate, and dissolve them in 1000g deionized water;

[0016] (2) Weigh 200g of ammonium dihydrogen phosphate and dissolve it in 1000g of deionized water;

[0017] (3) Mix the two solutions of step (1) and step (2), heat up to 80°C, and stir evenly;

[0018] (4) Immerse one or both ends of the honeycomb catalyst module to be hardened in the solution of step (3) for 10 seconds;

[0019] (5) Put the impregnated catalyst taken out in step (4) into a muffle furnace for calcination at 110°C for 30 minutes to allow the components in it to react with the catalyst to ensure that the edges of one or both ends of the catalyst are hardened.

specific Embodiment 2

[0020] A kind of end hardening treatment method of SCR denitration catalyst, its specific steps are as follows:

[0021] (1) Prepare the active solution: weigh 25g of ammonium metatungstate, 7g of cerium nitrate, and 20g of ammonium heptamolybdate, and dissolve them in 1000g of deionized water;

[0022] (2) Weigh 350g of ammonium dihydrogen phosphate and dissolve it in 1000g of deionized water;

[0023] (3) Mix the two solutions of step (1) and step (2), heat up to 80°C, and stir evenly;

[0024] (4) Immerse one or both ends of the honeycomb catalyst module to be hardened in the solution of step (3) for 7s;

[0025] (5) Put the impregnated catalyst taken out in step (4) into a muffle furnace for calcination at 110°C for 30 minutes to allow the components in it to react with the catalyst to ensure that the edges of one or both ends of the catalyst are hardened.

specific Embodiment 3

[0026] A kind of end hardening treatment method of SCR denitration catalyst, its specific steps are as follows:

[0027] (1) Prepare the active solution: Weigh 50g ammonium metatungstate, 10g cerium nitrate, and 15g ammonium heptamolybdate, respectively, and dissolve them in 1000g deionized water;

[0028] (2) Weigh 275g of ammonium dihydrogen phosphate and dissolve it in 1000g of deionized water;

[0029] (3) Mix the two solutions of step (1) and step (2), heat up to 80°C, and stir evenly;

[0030] (4) Immerse one or both ends of the honeycomb catalyst module to be hardened in the solution of step (3) for 5s;

[0031] (5) Put the impregnated catalyst taken out in step (4) into a muffle furnace for calcination at 110°C for 30 minutes to allow the components in it to react with the catalyst to ensure that the edges of one or both ends of the catalyst are hardened.

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Abstract

The invention provides an end hardening processing method for a SCR denitration catalyst, and the method helps to improve the end hardness of the catalyst, enable the catalyst to be relatively wear and increase the service life of the catalyst. The method comprises the concrete steps: (1) preparing an active solution, namely respectively weighing 1-5 parts of ammonium metatungstate, 0.5-1 part of cerium nitrate and 1-2 parts of ammonium heptamolybdate, and dissolving in 100 parts of deionized water; (2) weighing 20-35 parts of ammonium biphosphate and dissolving in 100 parts of deionized water; (3) mixing the two solutions in the step (1) and in the step (2), heating to 80 DEG C and stirring uniformly; (4) dipping one end or two ends of a to-be hardened honeycomb catalyst module into the solution obtained in the step (3) for 5 s-10 s; and (5) taking out the catalyst dipped in the step (4), putting in a muffle furnace, and calcining at 110 DEG C for 30 min, so as to react the compositions in the catalyst with the catalyst and guarantee to harden the edge of the one end or the two ends of the catalyst.

Description

technical field [0001] The invention relates to the technical field of SCR denitration catalysts, in particular to an end hardening treatment method of SCR denitration catalysts. Background technique [0002] As the country's control on nitrogen oxide emissions becomes more stringent, the amount of nitrogen oxides emitted into the atmosphere by stationary sources such as coal-fired boilers will be more and more strictly controlled. It is no longer possible to rely solely on low-nitrogen combustion technology. Meet strict emission standards. [0003] At present, the most widely used is the SCR denitrification catalyst. The flue gas environment in which it is located is relatively harsh, and the concentration of dust and heavy metals is high. The catalyst is severely washed out, and the catalyst is relatively easy to be worn and blocked, which greatly shortens the service life of the catalyst. . Contents of the invention [0004] In view of the above problems, the present ...

Claims

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Application Information

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IPC IPC(8): B01J33/00B01J37/02B01D53/90B01D53/56
Inventor 周伟沈阳浩
Owner 罗浩斯环保设备(上海)有限公司