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Catalyst used for denitrification and desulfurization of water-containing smoke

A catalyst and flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of complex catalyst preparation process, unsatisfactory desulfurization efficiency, high raw material cost, and achieve good hydrothermal stability. , excellent mechanical wear resistance, the effect of improving the utilization rate

Inactive Publication Date: 2018-12-21
北京晨晰环保工程有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Another example in the prior art is through nanoscale TiO 2 and diatomite, SBA-15 as catalyst carrier, and metal oxides as additives to prepare simultaneous denitrification and desulfurization catalysts. The catalyst prepared by this method has high denitrification efficiency, but the desulfurization efficiency of this method is not ideal at low temperature conditions. At the same time, the catalyst The preparation process is complex and the cost of raw materials is high

Method used

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  • Catalyst used for denitrification and desulfurization of water-containing smoke
  • Catalyst used for denitrification and desulfurization of water-containing smoke

Examples

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preparation example Construction

[0025] The preparation method of the catalyst for denitrification and desulfurization of water-containing flue gas is as follows:

[0026] Step 1: Preparation of titanium-tungsten alloy powder. The titanium-tungsten alloy raw material is melted in an intermediate frequency electric furnace. The molten metal liquid passes through a leak hole with a diameter of 5 mm to form an alloy liquid column. During the falling process, six streams of water are used to spray the alloy liquid column to form Wet titanium-tungsten alloy powder, dry the titanium-tungsten alloy powder, and finally reduce it with hydrogen to obtain titanium-tungsten alloy powder;

[0027] Step 2, mix with metal salt, add the titanium-tungsten alloy powder obtained in step 1 into the metal salt solution, completely immerse the titanium-tungsten alloy powder in the solution, heat the immersion solution, and slowly evaporate the water in the system until it evaporates to dryness, Dry at constant temperature to obtai...

Embodiment 1

[0031] Prepare the catalyst according to the following preparation method:

[0032] First, add 10.0g of titanium-tungsten alloy powder, the mesh number of titanium-tungsten alloy powder is 80 mesh, wherein the mass fraction of titanium is 80%, and the mass fraction of tungsten is 20%, add it to 10% ammonium metavanadate aqueous solution, stir fully, The impregnating solution was heated to 80°C to slowly evaporate the water in the system until it evaporated to dryness, and then dried at a constant temperature of 110°C for 16 hours to obtain a solid powder;

[0033] Then, take 6.0g of the solid powder prepared by the above method, 3.0g of industrial white clay, 0.5g of hydroxymethyl cellulose, 0.5g of polyethylene glycol, 1.0g of glycerol, and 15.0g of water, and mix them evenly to form a paste , the paste was vacuum extruded, air-dried at room temperature, calcined at 500° C. for 5 hours under nitrogen atmosphere, and cooled to obtain the catalyst of Example 1.

[0034] 5% of ...

Embodiment 2

[0036] Prepare the catalyst according to the following preparation method:

[0037] First, 10.0g of titanium-tungsten alloy powder, the mesh number of titanium-tungsten alloy powder is 100 mesh, wherein the mass fraction of titanium is 80%, and the mass fraction of tungsten is 20%, is added to 10% ammonium metamolybdate aqueous solution, fully stirred, The impregnating solution was heated to 80°C to slowly evaporate the water in the system until it evaporated to dryness, and then dried at a constant temperature of 110°C for 16 hours to obtain a solid powder;

[0038]Then, take 6.0g of the solid powder prepared by the above method, 3.0g of industrial white clay, 0.5g of hydroxymethyl cellulose, 0.5g of polyethylene glycol, 1.0g of glycerol, and 15.0g of water, and mix them evenly to form a paste , the paste was vacuum extruded, air-dried at room temperature, calcined at 500° C. for 5 hours under nitrogen atmosphere, and cooled to obtain the catalyst of Example 2.

[0039] 5% o...

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Abstract

The invention relates to a catalyst used for denitrification and desulfurization of water-containing smoke, and belongs to the technical field of industrial catalysis. The catalyst is prepared by mixing the following components in percentage by mass: 40%-60% of titanium-tungsten alloy powder, 20%-30% of industrial white mud, 3%-7% of metal-oxide active auxiliary, 3%-5% of binder, 2%-4% of pore-forming agent and 2%-8% of release agent. According to the technical scheme, in the catalyst, the industrial white mud is adopted as a desulfurizing agent, the discharging problem of the industrial whitemud is solved, the utilization rate of the industrial white mud is improved, the hydrothermal stability of the catalyst is good, and the mechanical wear resistance is good. The invention further relates to a preparation method of the catalyst; the method comprises the following steps of (1) titanium-tungsten alloy powder preparation, (2) mixing the titanium-tungsten alloy powder and metal salt and (3) catalyst preparation. The preparation method is low in production cost and simple in preparation process, and both the NOx denitrification efficiency and the SO2 removal rate are kept at high levels when the smoke temperature is higher than 150 DEG C.

Description

technical field [0001] The invention relates to a catalyst for denitrification and desulfurization of water-containing flue gas, and also relates to a preparation method of the catalyst, belonging to the technical field of industrial catalysis. Background technique [0002] At present, coal reserves are the highest in my country's fossil energy, and coal combustion is the most important part of the energy structure. During the coal combustion process, a large amount of nitrogen oxides (NO) will be produced. x and SO x , NO x and SO x Acid rain will form in the atmosphere, and it is also the main component of PM2.5. The country has issued a large number of relevant laws and regulations to control NO x and SO x emissions. At present, most power plants, steel mills, and industrial kilns use a step-by-step method for desulfurization and denitrification of flue gas. First, alkaline substances are used to desulfurize SO 2 For removal, the use of denitrification catalysts to ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/02B01D53/86B01D53/60
CPCB01D53/8637B01J27/22B01D2258/0283B01J35/00B01J35/30Y02A50/20
Inventor 张德生贾丽华赵振龙郭祥峰
Owner 北京晨晰环保工程有限公司
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