Method for preparing high-efficiency catalyst for chemically reducing nitrates in wastewater

A technology of catalysts and nitrates, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of shortened catalyst life, difficulty in ensuring the firm combination of active components and carriers, periodic stirring and room temperature Long drying time and other issues, to achieve the effect of high efficiency and stability of active components, high removal rate and N2 selectivity, and firm combination

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

[0035] Step 1. Put 100ml of saturated calcium hydroxide solution and 20g of macroporous polystyrene resin particles into the flask equipped with stirring. After stirring at room temperature for 60min, wash with deionized water until the washing water is neutral; add 100ml of resin particles into the flask. The methanol solution was stirred at room temperature, and after stirring for 60 minutes, washed with deionized water for 3 times for later use; the washed resin was put into a sodium hydroxide solution with a mass concentration of 5%, stirred for 35 minutes, and then washed; a saturated EDTA solution was prepared, and the pretreatment After the resin was immersed in a saturated EDTA solution for 6 hours, the resin carrier was taken out and vacuum-dried at room temperature;

[0036] Step 2, get 2.5gPdCl 2 and 0.07gCe (NO 3 ) 3 Dissolved in a mixed solution of 100 g of ethanol, water and citric acid, the concentration of ethanol in the mixed solution is 25%, the concentrati...

Embodiment 2

[0041] Step 1. Put 100ml of saturated calcium hydroxide solution and 18g of macroporous polystyrene resin particles into the flask equipped with stirring, and after stirring at room temperature for 80min, wash with deionized water until the washing water is neutral; add 100ml of resin particles into The methanol solution was stirred at room temperature, and after stirring for 80 minutes, it was washed with deionized water for 3 times for later use; the washed resin was put into a sodium hydroxide solution with a mass concentration of 5.5%, stirred for 40 minutes, and then washed; a saturated EDTA solution was prepared, and the pretreatment was carried out. After the resin was dipped into a saturated EDTA solution for 9 hours, the resin carrier was taken out and dried under vacuum at room temperature;

[0042] Step 2, get 2gPdCl 2 and 0.06gCe (NO 3 ) 3 Dissolved in a mixed solution of 100 g of ethanol, water and citric acid, the concentration of ethanol in the mixed solution ...

Embodiment 3

[0047] 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 100min, wash with deionized water until the washing water is neutral; add 100ml of resin particles into the flask. The methanol solution was stirred at room temperature, and after stirring for 100 min, washed with deionized water for 3 times for later use; the washed resin was put into a sodium hydroxide solution with a mass concentration of 5.2%, and washed after stirring for 50 min; a saturated EDTA solution was prepared, and the pretreatment After the resin was immersed in a saturated EDTA solution for 13 hours, the resin carrier was taken out and dried under vacuum at room temperature;

[0048] Step 2, get 3gPdCl 2 and 0.08gCe (NO 3 ) 3 Dissolved in a mixed solution of 100 g of ethanol, water and citric acid, the concentration of ethanol in the mixed solution is 27%, the concentrati...

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PUM

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Abstract

The method for preparing high-efficiency catalyst for chemically reducing nitrates in wastewater, and belongs to the field of wastewater treatment. The preparation steps comprise pre-treating macroporous polystyrene resin carrier by activation to prepare a precursor A of the catalyst, immersing the precursor A of the catalyst in an immersion liquid of PdCl2h and Ce(NO3)3; immersing the catalyst precursor in a saturated solution of EDTA (Ethylenediaminetetraacetic Acid), drying; and then immersing in a copper sulfate immersion liquid. By multi-step pretreatment of the carrier, the binding forceof the carrier to the EDTA and active components is increased, so that a large amount of metal ions are bonded and uniformly dispersed on the inner surface of exchange resin micropores, and the metalions are reduced to form metal clusters and deeply embedded in the three-dimensional network structure of resins, so that the activity is evenly dispersed on the resin and firmly bonded.

Description

technical field [0001] The invention discloses a preparation method of a high-efficiency catalyst for chemical reduction of nitrate in sewage, belonging to the field of sewage treatment. Background technique [0002] The nitrogen elements in the water body are mainly ionic nitrogen, of which nitrate nitrogen is the main, followed by ammonia nitrogen and nitrite nitrogen. These salts will cause pollution to the environment. Harm to human, animal and plant health. The sources of nitrate in nature mainly include two aspects. The sources of wastewater are wide and complex, such as fertilizer manufacturing, iron and steel production, gunpowder manufacturing, feed production, meat processing, electronic components and flue gas denitration absorption liquid, etc. Nitrate is ingested In humans and animals, part of it will be reduced to nitrite. Nitrite can oxidize hemoglobin in blood to iron hemoglobin, which does not have the ability to bind oxygen. When the content of iron hemog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/10B01J37/00B01J37/02B01J37/16C02F1/70
CPCB01J31/06B01J35/1023B01J35/1047B01J37/00B01J37/0201B01J37/16C02F1/70C02F2101/163
Inventor 李波刘婷婷潘咸峰黄斌袁辉志王秀丽解洪梅
Owner CHINA PETROLEUM & CHEM CORP
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