Method for preparing low-temperature denitration composite catalyst by adopting ultrasonic treatment and step-by-step impregnation method

A composite catalyst and low-temperature denitrification technology, which is applied in separation methods, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of active substances falling off easily, and achieve the effect of improving activity

Inactive Publication Date: 2014-05-14
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the active material is loaded by the ordinary impregnation method, the active material is easy to fall off

Method used

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  • Method for preparing low-temperature denitration composite catalyst by adopting ultrasonic treatment and step-by-step impregnation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A. First, 2g of oxalic acid is completely dissolved in 50g of water by ultrasound for 10min, then 0.0514g of ammonium metavanadate is added, and it is completely dissolved by ultrasound for 10min, then 0.2625g of ammonium tungstate is added, and it is completely dissolved by ultrasound for 10min. Use after it turns dark green.

[0025] B. Add 4g of titanium dioxide powder into another 250ml beaker containing 50ml of water, stir evenly, then add 3.579g of 50wt% manganese nitrate solution, 0.76g of cerium nitrate and 1.01g of ferric nitrate, and use ultrasound for 10min to completely dissolve, Stir.

[0026] C. Add the prepared vanadium-tungsten solution to the above solution, put it on the electric heating mantle and stir at 120°C for 2 hours to react.

[0027] D. Put the stirred sample into an oven set at a temperature of 120°C for drying.

[0028] E. After grinding the dried powder, screen out 20-40 mesh and calcinate at 400°C for 3 hours.

[0029] A high-efficiency...

Embodiment 2

[0031] A. First, 2g of oxalic acid is completely dissolved in 50g of water by ultrasonication for 10min, then 0.1542g of ammonium metavanadate is added, which is completely dissolved by ultrasonication for 10min, then 0.4374g of ammonium tungstate is added, which is completely dissolved by ultrasonication for 10min and stirred to form a vanadium-tungsten solution. Use after it turns dark green.

[0032] B. Add 4g of titanium dioxide powder into another 250ml beaker containing 50ml of water, stir evenly, then add 3.579g of 50wt% manganese nitrate solution, 0.76g of cerium nitrate and 1.01g of ferric nitrate, and use ultrasound for 10min to completely dissolve, Stir.

[0033] C. Add the prepared vanadium-tungsten solution to the above solution, put it on the electric heating mantle and stir at 120°C for 2 hours to react.

[0034] D. Put the stirred sample into an oven set at a temperature of 120°C for drying.

[0035] E. After grinding the dried powder, screen out 20-40 mesh a...

Embodiment 3

[0038] A. First, 2g of oxalic acid is completely dissolved in 50g of water by ultrasonication for 10min, then 0.2572g of ammonium metavanadate is added, which is completely dissolved by ultrasonication for 10min, then 0.4374g of ammonium tungstate is added, which is completely dissolved by ultrasonication for 10min and stirred to form a vanadium-tungsten solution. Use after it turns dark green.

[0039] B. Add 4g of titanium dioxide powder to another 250ml beaker containing 50ml of water, stir evenly, then add 7.158g of 50wt% manganese nitrate solution, 1.52g of cerium nitrate and 2.02g of ferric nitrate, and use ultrasound for 10min to completely dissolve, Stir.

[0040] C. Add the prepared vanadium-tungsten solution to the above solution, put it on the electric heating mantle and stir at 120°C for 2 hours to react.

[0041] D. Put the stirred sample into an oven set at a temperature of 120°C for drying.

[0042] E. After grinding the dried powder, screen out 20-40 mesh and...

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Abstract

The invention provides a method for preparing a low-temperature denitration composite catalyst by adopting ultrasonic treatment and a step-by-step impregnation method. The method comprises the following steps: ultrasonically treating 0.1-5g of oxalic acid for a certain time, completely dissolving the oxalic acid in water, adding 0.01-1g of ammonium metavanadate to perform the ultrasonic treatment, then adding 0.01-1g of ammonium tungstate to perform the ultrasonic treatment, and stirring to obtain a solution A; adding 1-10g of titanium dioxide powder into a container which contains the water, adding 1-20g of 50wt% manganese nitrate solution, 1-10g of cerium nitrate and 1-10g of ferric nitrate, performing the ultrasonic treatment until the added materials are completely dissolved to obtain a solution B; adding the solution A into the solution B, stirring and reacting for 0.5-3 hours at 100-200 DEG C; drying; grinding; roasting for 1-5 hours at 400-800 DEG C; cooling to room temperature, and then grinding to obtain the low-temperature denitration composite catalyst. According to the method disclosed by the invention, the ultrasonic treatment is combined with the step-by-step impregnation method to prepare a high-efficiency low-temperature denitration composite catalyst. The denitration efficiency of the prepared catalyst at 150-370 DEG C is over 80%, and the denitration activity at 230 DEG C is up to 95%.

Description

technical field [0001] The present invention relates to a preparation method of a low-temperature denitration composite catalyst, specifically a high-efficiency low-temperature denitration composite catalyst V 2 o 5 -WO 3 / MnO 3 -CeO 2 -Fe 2 o 3 / TiO 2 method of preparation. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants. NOx emitted into the atmosphere will form acid rain, destroy the ozone layer, produce a greenhouse effect, and damage human health. According to statistics, about 70% of the nitrogen oxides in my country's air pollution come from the direct combustion of coal. In 2012, the national nitrogen oxide emissions were 23.38 million tons. Therefore, the effective purification of nitrogen oxides is imminent. [0003] At present, measures to reduce NOx emissions are mainly divided into two types: combustion control and flue gas denitrification. In actual production, the reduction rate of NOx by low-NOx combustion techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/02B01J37/34B01D53/90B01D53/56
Inventor 董国君王永恩
Owner HARBIN ENG UNIV
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