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A kind of preparation method of denitrification catalyst

A technology of denitrification catalyst and sodium hydroxide, which is applied in the field of environmental catalysis, can solve the problems of high production costs, achieve the effects of increased added value, simple preparation process, and reduced production costs

Active Publication Date: 2020-02-21
极智智慧(上海)新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortage of high production cost of current denitrification catalysts, the present invention develops a new type of NH with tungsten slag as the main component 3 -SCR denitrification catalyst, the catalyst can be used at 150~400 o It has high catalytic activity in the range of C, and at the same time uses tungsten slag as raw material and provides a new way for the comprehensive utilization of tungsten slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of SCR denitration catalyst is realized through the following steps:

[0021] (1) Pretreatment of tungsten slag: crush the raw material of tungsten slag, screen out tungsten slag of 80~100 mesh and put it in a sodium hydroxide solution with a mass concentration of 20wt%. It is 15mL / g, treated in a water bath at 60°C for 10h under the condition of ultrasonic assistance, and then filtered, and the filtered cake was washed with deionized water until neutral, and then dried at 110°C for 12h;

[0022] (2) Modification of tungsten slag: Weigh 40g of sucrose and dissolve it in 200mL deionized water, stir at room temperature for 30min to dissolve completely, then add 200g of tungsten slag obtained in step (1) to it and continue stirring for 30min to obtain Mixture A, transfer the mixture A to a hydrothermal reactor and treat it at 200°C for 6 hours, then filter it, wash it with absolute ethanol three times, dry it at 110°C for 12 hours, and then roast it un...

Embodiment 2

[0025] A preparation method of SCR denitration catalyst is realized through the following steps:

[0026] (1) Pretreatment of tungsten slag: crush tungsten slag, screen out tungsten slag of 80~100 mesh and place it in a sodium hydroxide solution with a mass concentration of 20wt%, wherein the volume-mass ratio of sodium hydroxide solution to tungsten slag is 20mL / g, treated in a water bath at 60°C for 15h under the condition of ultrasonic assistance, and then filtered, and the filter cake obtained by filtration was washed to neutral, and then dried at 110°C for 12h;

[0027] (2) Modification of tungsten slag: Weigh 20g of sucrose, dissolve it in 200mL deionized water, stir at room temperature for 25min to dissolve completely, then add 100g of tungsten slag obtained in step (1) and continue stirring for 30min. To obtain mixture A, transfer the mixture A to a hydrothermal reactor and treat it at 220°C for 4h, then filter it, wash it twice with absolute ethanol, dry it at 110°C f...

Embodiment 3

[0030]A preparation method of SCR denitration catalyst is realized through the following steps:

[0031] (1) Pretreatment of tungsten slag: crush tungsten slag, screen out tungsten slag of 80~100 mesh and place it in a sodium hydroxide solution with a mass concentration of 20wt%, wherein the volume-to-mass ratio of sodium hydroxide solution to tungsten slag is 17mL / g, treated in a water bath at 60°C for 12h under the condition of ultrasonic assistance, and then filtered, and the filter cake obtained by filtration was washed to neutral, and then dried at 110°C for 12h;

[0032] (2) Modification of tungsten slag: Weigh 20g of sucrose and dissolve it in 200mL deionized water, stir at room temperature for 20min to dissolve completely, then add 100g of tungsten slag obtained in step (1) to it and continue stirring for 30min. Obtain mixture A; transfer the mixture A to a hydrothermal reaction kettle and treat it at 210°C for 5h, then filter and wash with ethanol for 4 times, dry it ...

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Abstract

The invention belongs to the technical field of environmental catalysis, and relates to a novel NH3-SCR denitration catalyst which takes tungsten slags as a main component. The denitration catalyst isprepared in the following steps of preprocessing tungsten slags, modifying the tungsten slags and loading active ingredients Cu-SAPO-34, wherein the step of modifying the tungsten slags is characterized in that saccharose solution and the tungsten slags are mixed and are subjected to hydro-thermal treatment, filtering, washing, drying and roasting in sequence. The catalyst prepared with the preparation method can have high catalytic activity in a range of 150-400oC, and meanwhile, the tungsten slags are adopted as raw materials so as to provide a new approach for the comprehensive utilizationof the tungsten slags.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis, and relates to a catalyst, in particular to a preparation method of a denitration catalyst. Background technique [0002] Nitrogen oxides are one of the main air pollutants in my country. They can form photochemical smog through complex photochemical reactions with volatile organic compounds VOC in the atmosphere, which is dangerous to human health; nitrogen oxide seas can form nitric acid and nitrate in the atmosphere Fine particles and long-distance transport, thus accelerating the deterioration of regional acid rain. The combustion of fossil fuels such as coal, oil, and natural gas used in industrial production processes is an important source of nitrogen oxide pollution, and more than 70% of my country's NOx emissions come from direct coal combustion. [0003] At present, the industrial removal of NO from flue gas x The most effective method is to use NH 3 For the reducing a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J35/10B01J37/10B01J37/08B01D53/86B01D53/56
Inventor 李俊霞
Owner 极智智慧(上海)新技术有限公司
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