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A kind of pd-cu bimetallic catalyst applied to denitrification of sewage and preparation method thereof

A bimetallic catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve catalyst life shortening, periodic stirring and room temperature drying time Long, difficult to ensure the firm combination of the active component and the carrier, etc., to achieve good particle dispersion, high removal rate and high N2 selectivity

Active Publication Date: 2021-10-22
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 a flask equipped with stirring. After stirring at room temperature for 60 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. Prepare EDTA saturated solution, impregnate the pretreated resin into EDTA saturated solution for 6 hours, take out the resin carrier, and dry it in vacuum at room temperature;

[0036] Step two, take 2.5gPdCl 2 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 0.8%, and the balance is water. After the temperature of the mixed solution was raised to 40° C., a low-power ultrasonic instrument was used for ultrasonication, the frequency of th...

Embodiment 2

[0041] 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. Prepare EDTA saturated solution, impregnate the pretreated resin into EDTA saturated solution for 9 hours, take out the resin carrier, and dry it in vacuum at room temperature;

[0042] Step two, take 2gPdCl 2 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 35° C., a low-power ultrasonic instrument was used for ultrasonication. The frequency of the ...

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 the resin particles to 100ml Stirring treatment at room temperature in methanol solution, stirring for 100 min, washing with deionized water 3 times for later use. Prepare EDTA saturated solution, impregnate the pretreated resin into EDTA saturated solution for 13 hours, take out the resin carrier, and dry it in vacuum at room temperature;

[0048] Step two, take 3gPdCl 2 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 temperature of the mixed solution was raised to 45° C., a low-power ultrasonic instrument was used for ultrasonication. The frequency of the ul...

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Abstract

The invention discloses a Pd-Cu bimetallic catalyst applied to sewage denitrification and a preparation method thereof, belonging to the field of sewage treatment. It is characterized in that it includes an active component and a carrier, and the content of the active component in the catalyst in terms of mass percentage includes: Pd 1%~1.5%, Cu 1%~1.5%; the carrier is macroporous polyphenylene Vinyl resin, the specific surface of the macroporous polystyrene resin is 400 m 2 / g~600m 2 / g, the pore volume is 0.4 m 3 / g~2.0m 3 / g, the pore size is 3.0 nm~5.0nm. Through the multi-step pretreatment of the carrier, the binding force between the carrier and EDTA and the active components is increased, so that a large number of metal ions are combined and evenly dispersed on the inner surface of the micropores of the exchange resin, and the metal ions are reduced to form metal clusters, deep Trapped in the three-dimensional network structure of the resin, the activity is evenly dispersed on the resin and firmly combined.

Description

technical field [0001] The invention discloses a Pd-Cu bimetallic catalyst applied to sewage denitrification and a preparation method thereof, belonging 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06C02F1/70C02F101/16
CPCB01J31/06C02F1/70C02F2101/163
Inventor 李波刘婷婷潘咸峰黄斌袁辉志解洪梅王秀丽
Owner CHINA PETROLEUM & CHEM CORP