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Preparation method of denitration catalyst for effectively inhibiting SO2 oxidation

A denitration catalyst, SO2 technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of blue smoke emission concentration, large deviation of removal efficiency, etc. , to achieve the effect of simple production process, low SO2 conversion rate and good denitration activity

Active Publication Date: 2014-07-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although denitrification devices generally require SO 2 / SO 3 The conversion rate is less than 1%, but for high-sulfur coal (SO 2 Concentration 2000-5000ppm), SO at the outlet of the denitrification device 3 The concentration can even reach 60-150mg / m 3 , or even higher
[0003] Although flue gas pollution control facilities such as dust removal and desulfurization devices can remove SO to varying degrees 3 , but the deviation of removal efficiency is large
According to the US EPA data, 75-85% of thermal power plants that use bituminous coal and are equipped with SCR denitrification devices and wet desulfurization facilities are caused by SO 3 There is a "blue smoke" problem due to high emission concentration, and wet desulfurization can only remove about 50% of SO 3

Method used

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  • Preparation method of denitration catalyst for effectively inhibiting SO2 oxidation
  • Preparation method of denitration catalyst for effectively inhibiting SO2 oxidation
  • Preparation method of denitration catalyst for effectively inhibiting SO2 oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An effective inhibitor of SO 2 The preparation method of the denitration catalyst of oxidation, the steps are as follows:

[0019] Step 1: Dissolve 0.0343g of ammonium metavanadate, 0.2814g of ammonium paratungstate and 1g of oxalic acid in 20mL of deionized water, and stir at 60°C until ammonium metavanadate, ammonium paratungstate and oxalic acid are dissolved in the solution to become solution 1;

[0020] Step 2: Add 5g of titanium dioxide into 20mL of deionized water and stir to form a suspension 1;

[0021] Step 3: Pour solution 1 into 20mL suspension 1, immerse and stir for 1 hour, then heat to 80°C, continue stirring until it becomes a paste, and dry at 120°C;

[0022] Step 4: Crushing the dried block and calcining in air at 550° C. for 5 hours to obtain the catalyst.

[0023] Catalyst evaluation conditions (the same below): 0.2g catalyst, flue gas concentration 500ppmNH 3 , 500ppm NO, 3%O 2 and 2000ppm SO 2 , the equilibrium gas is N 2 , the total gas volu...

Embodiment 2

[0025] An effective inhibitor of SO 2 The preparation method of the denitration catalyst of oxidation, the steps are as follows:

[0026] Step 1: Weigh 0.0343g of ammonium metavanadate and 0.2814g of ammonium paratungstate respectively, dissolve them in 20mL of 1g of oxalic acid solution, and stir at 60°C until ammonium metavanadate and ammonium paratungstate are dissolved in the oxalic acid solution to become solution 1;

[0027] Step 2: Add 0.0853g of barium nitrate, 0.0837g of magnesium nitrate and 0.0690g of strontium nitrate to 20mL of a suspension containing 5g of titanium dioxide, and stir for 1 hour to form a suspension 1;

[0028] Step 3: Pour solution 1 into suspension 1, immerse and stir for 1 hour, then heat to 80°C, continue to stir until it becomes a paste, and dry at 120°C;

[0029] Step 4: crush the dried block and calcinate in air at 550° C. for 5 hours to obtain the catalyst.

[0030] figure 2 Be the denitrification efficiency and SO of embodiment 2 2 co...

Embodiment 3

[0032] An effective inhibitor of SO 2 The preparation method of the denitration catalyst of oxidation, the steps are as follows:

[0033] Step 1: Dissolve 0.0343g of ammonium metavanadate, 0.2814g of ammonium paratungstate and 1g of oxalic acid in 20mL of deionized water, and stir at 60°C until the ammonium metavanadate and ammonium paratungstate are dissolved in the oxalic acid solution to become solution 1;

[0034] Step 2: Add 0.0853g of barium nitrate to 4.75g of titanium dioxide, 0.83g of silica sol (5wt%); or 4.5g of titanium dioxide, 1.67g of silica sol (10wt%); or 4g of titanium dioxide, 3.35g of silica sol ( 20wt%) in the mixed solution for 1 hour and stirred for 1 hour to become a suspension 1;

[0035] Step 3: Pour solution 1 into suspension 1, immerse and stir for 1 hour, then heat to 80°C, continue to stir until it becomes a paste, and dry at 120°C;

[0036] Step 4: Crushing the dried block and calcining in air at 550° C. for 5 hours to obtain the catalyst.

[...

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Abstract

The invention relates to a preparation method for a denitration catalyst for effectively inhibiting SO2 oxidation. The preparation method comprises the following steps: adding ammonium metavanadate and ammonium paratungstate into an oxalic acid solution, and stirring to obtain a solution; adding nitrate barium, magnesium nitrate and strontium nitrate or a solution prepared from a mixture of nitrate barium, magnesium nitrate and strontium nitrate into a mixed solution of titanium dioxide and ludox, and steeping and stirring, thus obtaining a turbid liquid; then pouring the solution into the turbid liquid of the same volume, steeping, stirring, heating, and stirring again until a mixture becomes pasty, and drying; and mashing blocks obtained through drying, and calcining in the air to obtain the catalyst. The catalyst is used for reducing the SO2 oxygenation efficiency under high-concentration SO2 smoke condition, and is widely applied to the NOx catalytic reduction of high-sulphur coal-fired power plants and industrial boilers.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a method for effectively suppressing SO 2 A method for preparing an oxidized denitrification catalyst. Background technique [0002] A large part of my country's coal is high-sulfur coal, mainly distributed in Sichuan, Guizhou, Guangxi, Shandong, Shaanxi and other provinces. SO produced during the combustion of this high-sulfur coal 3 It is easy to form aerosols, leading to an increase in the concentration of fine particulate matter PM2.5, which has caused frequent large-scale regional heavy pollution and haze weather in my country in recent years, which has seriously affected people's health and production and life. SO emissions from coal-fired power plants 3 In addition to combustion, there is also a large part from the SCR denitrification catalyst to SO in the flue gas 2 Oxidation. Active component V of industrial SCR denitrifica...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/56B01D53/86B01J21/06B01J21/08B01J21/10B01J23/22B01J23/30
Inventor 李俊华彭悦李柯志郝吉明
Owner TSINGHUA UNIV
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