A kind of cheap denitrification catalyst and preparation method thereof

A denitrification catalyst and cheap technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high production cost and hinder application, achieve added value improvement, strengthen anti-sulfur activity, and reduce production The effect of fees

Active Publication Date: 2020-06-09
渤瑞环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the SCR catalysts developed in my country are mainly anatase TiO 2 Or molecular sieve as a carrier catalyst, but its high production cost hinders its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Pretreatment of vanadium slag: crush the raw material of vanadium slag, screen out 20-40 mesh vanadium slag and dissolve it in dilute nitric acid solution with a mass concentration of 3%, wherein the mass-volume ratio of vanadium slag and dilute nitric acid solution is 0.1g / mL, after treatment at 60°C for 2h, filter, wash the filtered vanadium slag until neutral, dry at 102°C for 8h, and then roast at 450°C for 4h;

[0024] 2) Mixing of vanadium slag: mix the vanadium slag obtained in step 1) with attapulgite at a weight ratio of 1:4, and then process it in a planetary mill for 3 hours to make it fully mixed;

[0025] 3) Modification of vanadium slag: Weigh 100g of sucrose, dissolve it in 200mL deionized water, stir at room temperature for 15 minutes to dissolve completely, then add 100g of the mixture obtained in step 2) to it and continue stirring for 8 minutes to obtain mixture A ; transfer the mixture A to a hydrothermal reaction kettle, and treat it at 220°C fo...

Embodiment 2

[0029] 1) Pretreatment of vanadium slag: crush the raw material of vanadium slag, screen out 20-40 mesh vanadium slag and dissolve it in dilute nitric acid solution with a mass concentration of 5%, wherein the mass-volume ratio of vanadium slag and dilute nitric acid solution is 0.5g / mL, after treatment at 80°C for 30 minutes, filter, wash the filtered vanadium slag until neutral, first dry at 108°C for 4 hours, and then roast at 550°C for 2 hours; 2) Vanadium slag mixture : Mix the vanadium slag obtained in step 1) with attapulgite at a ratio of 1:4 by weight, and then process it in a planetary mill for 3 hours to make it fully mixed;

[0030]3) Modification of vanadium slag: Weigh 100g of sucrose and dissolve it in 200mL deionized water, stir at room temperature for 25min to dissolve completely, then add 100g of the mixture obtained in step 2) to it and continue stirring for 12min to obtain mixture A ; transfer the mixture A to a hydrothermal reaction kettle, and treat it a...

Embodiment 3

[0034] 1) Pretreatment of vanadium slag: crush the raw material of vanadium slag, screen out 20-40 mesh vanadium slag and dissolve it in dilute nitric acid solution with a mass concentration of 4%, wherein the mass volume ratio of vanadium slag and dilute nitric acid solution is 0.3g / mL, and then put it in a hydrothermal kettle at 70°C for 1 hour, then filter it, wash the filtered vanadium slag until neutral, dry it at 105°C for 6 hours, and finally roast it at 500°C for 3 hours ;

[0035] 2) Mixing of vanadium slag: mix the vanadium slag obtained in step 1) with attapulgite at a weight ratio of 1:4, and then process it in a planetary mill for 3 hours to make it fully mixed;

[0036] 3) Modification of vanadium slag: Weigh 100g of sucrose and dissolve it in 200mL of deionized water, stir at room temperature for 20min to dissolve completely, then add the mixture obtained in step 2) to it and continue stirring for 10min to obtain mixture A; Mixture A was transferred to a hydro...

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Abstract

The invention discloses a low-price denitrification catalyst and a preparation method thereof. The catalyst is prepared by the steps of vanadium slag pretreatment, vanadium slag mixing, vanadium slagmodification and active component loading, wherein the step of vanadium slag modification comprises the steps of adding a vanadium slag mixture into a sucrose solution, treating for 2-4h at the temperature of 180-220 DEG C, filtering, and then washing a filter cake; carrying out drying treatment for 5-8h at the temperature of 105-115 DEG C, and roasting for 3.5-4.5h in nitrogen atmosphere at the temperature of 485-515 DEG C so as to obtain modified vanadium slag coated with a carbon microsphere coating. In the catalyst prepared by the method, the element molar ratio of nMo to nNb to nCe is equal to 1 to (0.2-2) to (0.2-2), and the weight ratio of a MoO3 precursor to the modified vanadium mixture is equal to (1-3) to 20. According to the preparation, vanadium slag is taken as a raw materialand is converted into the novel denitrification catalyst by means of modification; the catalyst has high catalytic activity within a temperature range of 200-400 oC.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, and relates to a denitration catalyst, in particular to a vanadium slag-based denitration catalyst and a preparation method thereof. Background technique [0002] With the global consumption of fossil energy such as coal, a large amount of nitrogen oxides (NOx) will be emitted during the combustion of these fossil fuels. x ) pollutes the air, which in turn threatens and destroys human health and the ecological environment. Atmospheric NO present x It mainly comes from the tail gas emitted by motor vehicles and the flue gas produced by coal-fired boilers. In the denitrification technology, NH 3 -SCR denitrification technology is the most widely used and most mature flue gas purification technology in industry, and the core of this technology is catalyst, and its industrialized catalyst system is MO 3 -V 2 o 5 / TiO 2 or WO 3 -V 2 o 5 / TiO 2 , the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J35/10B01D53/90B01D53/56
Inventor 李俊霞
Owner 渤瑞环保股份有限公司
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