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Preparation method of nitrate nitrogen denitrification catalyst

A technology of denitrification catalyst and nitrate nitrogen, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Stirring and drying at room temperature take a long time to achieve the effect of high removal rate and N2 selectivity, high efficiency and stability of active components, and increased binding force

Active Publication Date: 2019-02-12
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation of the catalyst, periodic stirring and drying at room temperature take a long time
In addition, for supported catalysts, calcination at 350 °C is difficult to ensure the firm combination of active components and supports, which will easily lead to shortened catalyst life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1. Put 100ml of saturated calcium hydroxide solution and 20g of macroporous polystyrene resin particles into a flask equipped with stirring. After stirring at room temperature for 90 minutes, wash with deionized water until the washing water is neutral; add the resin particles to 100ml Stirring treatment at room temperature in methanol solution, stirring for 60 min, washing with deionized water 3 times for later use. A saturated EDTA solution was prepared, and the pretreated resin was immersed in the saturated EDTA solution for 6 hours, and then the resin carrier was taken out and dried in vacuum at room temperature.

[0042] Step two, take 2.5gPdCl 2 and 0.07g Ce(NO3) 3 Dissolve in a mixed solution of 100g ethanol, water and citric acid, the concentration of ethanol in the mixed solution is 25%, the concentration of citric acid is 0.7%, and the balance is water. After the temperature of the mixed solution was raised to 40° C., a low-power ultrasonic instrument ...

Embodiment 2

[0046] Step 1. Put 100ml of saturated calcium hydroxide solution and 18g of macroporous polystyrene resin particles into a flask equipped with stirring. After stirring at room temperature for 80 minutes, wash with deionized water until the washing water is neutral; add the resin particles to 100ml Stirring treatment at room temperature in methanol solution, stirring for 80 min, washing with deionized water 3 times for later use. The EDTA saturated solution was prepared, and the pretreated resin was immersed in the EDTA saturated solution for 24 hours, and then the resin carrier was taken out, and vacuum-dried at room temperature.

[0047] Step two, take 2gPdCl 2 and 0.08gCe (NO 3 ) 3 Dissolve in a mixed solution of 100g ethanol, water and citric acid, the concentration of ethanol in the mixed solution is 27%, the concentration of citric acid is 0.8%, and the balance is water. After the mixed solution was heated to 35°C, a low-power ultrasonic instrument was used for ultras...

Embodiment 3

[0051] Step 1. Put 100ml of saturated calcium hydroxide solution and 22g of macroporous polystyrene resin particles into a flask equipped with stirring. After stirring at room temperature for 90 minutes, wash with deionized water until the washing water is neutral; add the resin particles to 100ml Stirring treatment at room temperature in methanol solution, stirring for 60 min, washing with deionized water 3 times for later use. A saturated EDTA solution was prepared, and the pretreated resin was immersed in the saturated EDTA solution for 6 hours, and then the resin carrier was taken out and dried in vacuum at room temperature.

[0052] Step two, take 3gPdCl 2 and 0.09gCe (NO 3 ) 3 Dissolve in a mixed solution of 100g ethanol, water and citric acid, the concentration of ethanol in the mixed solution is 23%, the concentration of citric acid is 0.6%, and the balance is water. After the temperature of the mixed solution was raised to 45° C., a low-power ultrasonic instrument...

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Abstract

The invention provides a preparation method of a nitrate nitrogen denitrification catalyst and belongs to the field of sewage treatment. The preparation method is characterized by comprising the following preparation steps: activating and pre-treating a macroporous polystyrene resin carrier through a plurality of steps; carrying out one-step preparation of a compound catalyst; preparing a PdCl2 and Ce(NO3)3 primary impregnation solution; then carrying out ultrasonic treatment; after adding citric acid and tri-n-butyl citrate, adding copper acetate for dissolving; preparing an impregnation solution; impregnating the carrier in the impregnation solution and complexing; then impregnating into a mixed solution of sodium hydroxide and hydrazine hydrate to prepare the catalyst. According to thepreparation method, a common two-step preparation method is improved into a one-step preparation method; meanwhile, the activity and nitrogen gas selectivity of the catalyst are not reduced; a preparation technology is simple, scientific and reasonable. Metal ions are reduced to form a metal cluster and the metal cluster is deeply sunk into a three-dimensional network structure, so that the activity is uniformly distributed on the resin and the combination is firm.

Description

technical field [0001] The invention discloses a preparation method of a nitrate nitrogen denitrification catalyst, which belongs to the field of sewage treatment. Background technique [0002] The nitrogen element in the water body is mainly ionic nitrogen, of which nitrate nitrogen is the main one, followed by ammonia nitrogen and nitrite nitrogen. These salts will pollute the environment. Hazards to human, animal and plant health. The sources of nitrate in nature mainly include two aspects. Wastewater has a wide range of sources and complex components, such as fertilizer manufacturing, steel production, gunpowder manufacturing, feed production, meat processing, electronic components and flue gas denitrification absorption liquid, etc. Nitrate is ingested After human and animal body, some will be reduced to nitrite. Nitrite can oxidize the hemoglobin in the blood to ferric hemoglobin, which does not have the ability to bind oxygen. When the content of ferric hemoglobin i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J23/63B01J35/10B01J37/02B01J37/34C02F1/70C02F101/16
CPCC02F1/705B01J23/63B01J31/1658B01J37/0201B01J37/343B01J2531/16B01J2531/38B01J2531/824C02F2101/163B01J35/617B01J35/638B01J35/615B01J35/635B01J35/647
Inventor 李波潘咸峰刘婷婷黄斌吕军杜毅解洪梅
Owner CHINA PETROLEUM & CHEM CORP
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