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Low-temperature flue gas denitration catalyst powder and preparation method of low-temperature flue gas denitration catalyst powder

A denitrification catalyst and low-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low flue gas temperature, narrow application temperature range, and low removal efficiency. Achieve the effects of improving low-temperature SCR activity, increasing the load area, and increasing the contact area

Inactive Publication Date: 2016-07-13
东营信拓汽车消声器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for industrial application conditions other than power plant boilers, due to the low flue gas temperature, usually below 300°C, ordinary denitrification catalysts cannot be used normally
[0004] Therefore, the existing low-temperature denitrification catalyst technology cannot be applied on a large scale, and the main disadvantages are narrow application temperature range, low removal efficiency, and short practical application life.

Method used

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Examples

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Effect test

preparation example Construction

[0015] The preparation method of described low-temperature flue gas denitrification catalyst comprises:

[0016] (1) Configure the active component solution: the precursor of vanadium oxide ammonium metavanadate, the precursor of molybdenum oxide ammonium paramolybdate, the precursor of tungsten oxide ammonium paratungstate in proportion (ammonium metavanadate 0.13-3.87 mass 0.12-3.81 parts by mass of ammonium paramolybdate, 1.13-5.65 parts by mass of ammonium paratungstate, the ratio of vanadium oxide to ammonium metavanadate is 0.775, the ratio of molybdenum oxide to ammonium paramolybdate is 0.885, the ratio relationship between tungsten oxide and ammonium paratungstate 0.81) in deionized water, then add 0.3-0.8 parts by mass of copper nitrate, 0.02-0.1 parts by mass of boric acid and 0.03-0.3 parts by mass of triammonium phosphate, heat the solution to 50°C-60°C, and then add oxalic acid Adjust the pH of the solution to 2.0-3.0.

[0017] (2) Catalyst supported by impregna...

Embodiment 1

[0020] (1) Preparation of raw materials (mass fraction of each component): 3% ammonium metavanadate, 3% ammonium paramolybdate, 4% ammonium paratungstate, 0.5% copper nitrate, 0.1% boric acid, 0.3% triammonium phosphate, nano anatase Type titanium dioxide 89.1%.

[0021] (2) Prepare the active component solution: first prepare deionized water of the same quality as titanium dioxide, first add ammonium metavanadate, ammonium paramolybdate, ammonium paratungstate, then add copper nitrate, boric acid, triammonium phosphate, heat the solution to 60 °C and add Oxalic acid, adjust the pH to 2.0.

[0022] (3) Catalyst supported by impregnation method: slowly add nano-anatase titanium dioxide to the active component solution, stir and impregnate in the solution at 50°C-60°C for 2.5 hours, and use ultrasonic waves to disperse the mixed active component solution to promote homogeneity. and then dried at 150°C for 10 hours, then calcined at 430°C in air for 3-5 hours, and pulverized to ...

Embodiment 2

[0024] (1) Preparation of raw materials (mass fraction of each component): 3.5% ammonium metavanadate, 2.5% ammonium paramolybdate, 3% ammonium paratungstate, 0.6% copper nitrate, 0.05% boric acid, 0.2% triammonium phosphate, nano anatase Type titanium dioxide 90.15%.

[0025] (2) Prepare the active component solution: first prepare deionized water of the same quality as titanium dioxide, first add ammonium metavanadate, ammonium paramolybdate, ammonium paratungstate, then add copper nitrate, boric acid, triammonium phosphate, heat the solution to 60 °C and add Oxalic acid, adjust the pH to 2.0.

[0026] (3) Catalyst supported by impregnation method: slowly add nano-anatase titanium dioxide to the active component solution, stir and impregnate in the solution at 50°C-60°C for 2.5 hours, and use ultrasonic waves to disperse the mixed active component solution to promote homogeneity. and then dried at 150°C for 10 hours, then calcined at 430°C in air for 3-5 hours, and pulveriz...

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Abstract

The invention discloses low-temperature flue gas denitration catalyst powder and a preparation method of the low-temperature flue gas denitration catalyst powder. The low-temperature flue gas denitration catalyst powder takes vanadium oxide, molybdenum oxide and tungstic oxide as main active components, takes phosphorus oxide, boron oxide and copper oxide as auxiliary active components and takes titanium dioxide as a carrier. The preparation method comprises the following steps: dissolving ammonium metavanadate, ammonium heptamolybdate and ammonium paratungstate into de-ionized water, and adding copper nitrate, boric acid and triammonium phosphate; heating and adjusting the pH value of the solution to be 2.0 to 3.0; slowly adding nano anatase titanium dioxide into an active component solution and dispersing the mixed active component solution by utilizing ultrasonic waves; drying and calcining to obtain the catalyst. According to the low-temperature flue gas denitration catalyst powder, the activity and the catalytic capability of the low-temperature denitration catalyst are remarkably improved; the low-temperature flue gas denitration catalyst powder has higher mechanical strength and anti-corrosion property, has stronger industrial application value and can be widely applied to NH3 selective catalytic reduction of nitrogen oxide in flue gas.

Description

a technical field [0001] The invention relates to the technical field of catalysts, in particular to a NH 3 Selective Catalytic Reduction (SCR) Removal of NO X Catalysts and methods for their preparation. Two technical background [0002] Nitrogen oxides (NO X ) mainly comes from the combustion of fossil fuels. It can not only produce acid rain, but also react with hydrocarbons to form photochemical smog. It is one of the main sources of pm2.5 pollutants. Therefore, targeted development of high-efficiency NO X Emission control technologies have significant implications for improving air quality. [0003] NO X The treatment mainly adopts the methods of combustion process and post-combustion treatment. At present, low nitrogen combustion (LNB), selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) technologies are mainly used in industry. LNB technology is to change the combustion method of fuel, and the efficiency is usually only 30-40%. The r...

Claims

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Application Information

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IPC IPC(8): B01J27/199
CPCB01J27/199
Inventor 延晓峰杜德亮
Owner 东营信拓汽车消声器有限公司
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