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Nitrate radical chemical reduction catalyst and preparation method thereof

A catalyst, nitrate technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instruments and methods, etc., can solve the problem of shortened catalyst life, difficult to ensure the firm combination of active components and carriers, periodic stirring and room temperature Long drying time and other problems, to achieve the effect of high efficiency and stability of active components, increased binding force, and good particle dispersibility

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

[0034] 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;

[0035] Step two, take 2.5gPdCl 2 and 0.07gCe(NO 3 ) 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 0.8%, 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 ultrasonicati...

Embodiment 2

[0040] 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;

[0041] Step two, take 2gPdCl 2 and 0.06gCe(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 35° C., a low-power ultrasonic instrument was used for ultrasonication...

Embodiment 3

[0046] 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;

[0047] Step two, take 3gPdCl 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 temperature of the mixed solution was raised to 45° C., a low-power ultrasonic instrument was used for ultrasonication. ...

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Abstract

The invention provides a nitrate radical chemical reduction catalyst and a preparation method thereof, and belongs to the field of sewage treatment. The nitrate radical chemical reduction catalyst ischaracterized by comprising an active ingredient and a carrier, wherein the active ingredients include 1 to 1.5 percent of Pd and 1 to 1.5 percent of Cu in percentage by mass in the catalyst; the carrier is macroporous polystyrene resin; the specific surface area of the macroporous polystyrene resin is 400 m<2> / g to 600m<2> / g; the hole volume is 0.4 m<3> / g to 2.0m<3> / g; the hole diameter is 3.0 nmto 5.0nm. Through the multi-step pretreatment on the carrier, the combination power between the carrier and the EDTA and active ingredients is increased, so that a great number of metal irons are combined and are uniformly dispersed onto the inner surface of the exchange resin micropores; the metal ions are reduced to form metal clusters deep sunk into a three-dimension network structure of the resin, so that the uniform activity dispersion and firm combination on the resin can be achieved.

Description

technical field [0001] A nitrate chemical reduction catalyst and a preparation method thereof belong 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 in the blood increases, the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/10B01J37/34B01J37/02C02F1/70C02F101/16
CPCC02F1/70B01J31/06B01J37/0203B01J37/0236B01J37/343C02F2101/163B01J35/617B01J35/638B01J35/615B01J35/635B01J35/633B01J35/647
Inventor 李波潘咸峰刘婷婷黄斌吕军杜毅
Owner CHINA PETROLEUM & CHEM CORP