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Sulfating modified iron-tungsten-titanium SCR (selective catalytic reduction) denitration catalyst as well as preparation method and application thereof

A denitrification catalyst and sulfation technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of poor denitrification catalytic performance, complicated preparation process, high production cost, etc., and achieve good application prospects, The preparation process is simple and the effect of high activation temperature range

Pending Publication Date: 2022-03-08
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: the existing iron-based denitrification catalyst has problems such as complex preparation process, high production cost, and poor denitrification catalytic performance.

Method used

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  • Sulfating modified iron-tungsten-titanium SCR (selective catalytic reduction) denitration catalyst as well as preparation method and application thereof
  • Sulfating modified iron-tungsten-titanium SCR (selective catalytic reduction) denitration catalyst as well as preparation method and application thereof
  • Sulfating modified iron-tungsten-titanium SCR (selective catalytic reduction) denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example provides a method for preparing a sulfated modified iron-tungsten-titanium SCR denitration catalyst, the specific steps are:

[0030] (1) Tetrabutyl titanate, ethanol and nitric acid were mixed and stirred in a beaker at a volume ratio of 5:20:1 for 35 minutes.

[0031] (2) Mix ethanol and deionized water in a beaker at a volume ratio of 1:1, then add 0.067g of thiourea, 4.75g of Fe(NO 3 ) 3 ·9H 2 O, and 0.84g of ammonium tungstate were dissolved in the solution and stirred for 1h.

[0032] (3) The solution obtained in step (2) was slowly added dropwise to the solution obtained in step (1) under vigorous stirring, and the stirring was continued for 2.5 h to obtain a light yellow sol.

[0033] (4) Place the sol obtained in step (3) in an oven and dry it at 80° C. for 12 hours to remove water and organic solvents.

[0034] (5) The product obtained in step (4) is placed in a tube furnace, and heat-treated in still air at a treatment temperature of 450° C.,...

Embodiment 2

[0036] This example provides a method for preparing a sulfated modified iron-tungsten-titanium SCR denitration catalyst, the specific steps are:

[0037] (1) Tetrabutyl titanate, ethanol and nitric acid were mixed and stirred in a beaker at a volume ratio of 5:20:1 for 30 minutes.

[0038] (2) Mix ethanol and deionized water in a beaker at a volume ratio of 1:1, then add 0.134g of thiourea, 4.75g of Fe(NO 3 ) 3 ·9H 2 O, and 0.84g of ammonium tungstate were dissolved in the solution and stirred for 1.5h.

[0039] (3) The solution obtained in step (2) was slowly added dropwise to the solution obtained in step (1) under vigorous stirring, and the stirring was continued for 2 hours to obtain a light yellow sol.

[0040](4) The sol obtained in step (3) is placed in an oven, and dried at 80° C. for 12 hours to remove water and organic solvent.

[0041] (5) placing the product obtained in step (4) in a tube furnace, and performing heat treatment under still air at a treatment tem...

Embodiment 3

[0043] The present embodiment provides a preparation method of a sulfated modified iron-tungsten-titanium SCR denitration catalyst, the specific steps are:

[0044] (1) Mix and stir tetrabutyl titanate, ethanol and nitric acid in a beaker at a volume ratio of 5:20:1 for 25 minutes.

[0045] (2) Mix ethanol and deionized water in a beaker at a volume ratio of 1:1, then mix 0.225g thiourea, 4.75g Fe(NO 3 ) 3 ·9H 2 O, and 0.84g of ammonium tungstate were dissolved in the solution and stirred well for 2h.

[0046] (3) The solution obtained in step (2) was slowly added dropwise to the solution obtained in step (1) under vigorous stirring, and the stirring was continued for 1.5 h to obtain a pale yellow sol.

[0047] (4) The sol obtained in step (3) is placed in an oven, and dried at 80° C. for 12 hours to remove water and organic solvent.

[0048] (5) placing the product obtained in step (4) in a tube furnace, and performing heat treatment under still air at a treatment tempera...

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Abstract

The invention discloses a sulfation-modified iron-tungsten-titanium SCR (selective catalytic reduction) denitration catalyst as well as a preparation method and application thereof. According to the preparation method, ferric nitrate or ferric nitrate nonahydrate, ammonium tungstate and tetrabutyl titanate are used as raw materials, iron-tungsten-titanium is prepared through a sol-gel method and a high-temperature calcination method, and thiourea is added in the sol process to prepare the sulfated iron-tungsten-titanium catalyst. The catalyst has relatively strong oxidation-reduction capability and more acidic sites, has relatively strong adsorption capability on NO, and can keep the denitration efficiency of 90% or above within a reaction temperature interval of 240-460 DEG C, so that the denitration efficiency is effectively improved. The preparation method disclosed by the invention is simple, and the prepared catalyst is relatively fine in particle, good in dispersity and relatively good in medium-high temperature catalytic activity.

Description

technical field [0001] The invention relates to a sulfuration-modified iron-tungsten-titanium SCR denitrification catalyst, a preparation method and application thereof, and belongs to the technical field of industrial catalysis. Background technique [0002] The combustion of coal produces a large amount of harmful gases, such as sulfur dioxide (SO 2 ), nitrogen oxides (NO x ), carbon monoxide (CO) and VOC, etc. Among them, nitrogen oxides (NO x ) mainly includes NO and NO 2 , and its increasing emissions have caused serious environmental pollution such as smog, acid rain, and photochemical smog. In addition, the emission of nitrogen oxides will accelerate the formation of secondary aerosols and particulate matter such as PM2.5. Therefore, controlling NO x emissions are imminent. [0003] NO from stationary sources x The proportion is huge, and it has attracted more and more attention from researchers. A series of NO x Control technology has been researched and ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56
CPCB01J27/053B01D53/8628B01D2258/0283
Inventor 金双玲韩奇杭加旺杨超群蔡礼林汤雯珺马瑞泽朱瑶侬魏子洋付金昕王晓瑞张睿金鸣林
Owner SHANGHAI INST OF TECH
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