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Preparation method of denitration catalyst

A denitrification catalyst and solvothermal technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of small crystal grains, reduced production costs, and low oxidative properties

Inactive Publication Date: 2012-05-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still no relevant reports on denitrification catalysts with stable anti-sulfur and anti-water intoxication properties applied at 200-420 °C

Method used

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  • Preparation method of denitration catalyst

Examples

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Effect test

Embodiment 1

[0038] This example is used to illustrate the preparation method of the denitration catalyst provided by the present invention.

[0039] Dissolve 12g of ammonium tungstate and 200g of titanyl sulfate in 700mL of water, then conduct a hydrothermal reaction at 150°C for 10 hours, with a stirring speed of 200 rpm. After the hydrothermal reaction was completed, the sample was taken out and filtered, dried at 100°C for 10 hours, and then calcined at 450°C for 8 hours to obtain WO 3 Titanium tungsten powder with a content of 10wt.% is denoted as A1. The titanium tungsten powder has been characterized as having a surface area of ​​120m 2 / g, the grain size is 10-30nm, and the average particle size is 10μm.

Embodiment 2

[0041] This example is used to illustrate the preparation method of the denitration catalyst provided by the present invention.

[0042] Dissolve 1.5g of ammonium metavanadate and 5g of oxalic acid in 70mL of water, add 100g of the titanium-tungsten powder prepared in Example 1, mix and stir to form a slurry, let stand at room temperature for a period of time, dry at 100°C for 10 hours, and then dry at 400°C ℃ for 5 hours to prepare V 2 o 5 The content is 1wt.%, WO 3 The denitration catalyst with a content of 10wt.%, denoted as A2, was used for activity evaluation.

Embodiment 3

[0044] This example is used to illustrate the preparation method of the denitration catalyst provided by the present invention.

[0045] Dissolve 1.5g of ammonium metavanadate and 5g of oxalic acid in 700mL of water, add 100g of the titanium-tungsten powder prepared in Example 1 and mix them, then conduct a hydrothermal reaction at 200°C for 10 hours. After the hydrothermal reaction was completed, the sample was taken out and filtered, dried at 100°C for 10 hours, and then calcined at 600°C for 4 hours to obtain V 2 o 5 The content is 1wt.%, WO 3 The denitration catalyst with a content of 10wt.%, denoted as A3, was used for activity evaluation.

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Abstract

The invention provides a preparation method of a denitration catalyst, comprising the following steps of: (1) dissolving or dispersing a titanium source precursor and a tungsten source precursor in water to obtain a precursor solution; (2) pouring the precursor solution into a solvent thermal autoclave with stirring for hydrothermal reaction; (3) filtering, washing and drying after the hydrothermal reaction so as to obtain the titanium-tungsten powdered denitration catalyst. According to the preparation method, the hydrothermal synthesis method is adopted to introduce an active component in the mode of in situ synthesis. As the active component is characterized by small crystal grain, low oxidizability and large specific surface, the component can maintain a monolayer dispersion state in a large range. By the titanium-tungsten powder hydrothermal synthesis technology provided by the invention, nationalization of key raw materials of the denitration catalyst can be realized, thus substantially reducing the manufacturing cost of present denitration catalysts.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst. Background technique [0002] Nitrogen oxides are one of the main air pollutants that cause a series of problems such as acid rain and photochemical smog that damage the earth's ecological environment, and are also the key and difficult points in the current atmospheric environmental protection. More than 90% of nitrogen oxides (NO X ) originates from the combustion process of fossil fuels (such as coal, oil, natural gas, etc.), 70% of which comes from the combustion of coal, while the coal used for thermal power and various industrial boilers and kilns accounts for more than 70% of the country’s coal consumption, so man-made NO X The main sources of emissions are thermal power plants and various industrial boilers and kilns. Due to NO for coal-fired industrial boilers X Emission control technology is still immature. In the "Emission Standard of Air Pollutants for Boilers" (GB...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/34B01J37/08B01D53/86B01D53/56
Inventor 余剑郭凤李强汪印董利高士秋许光文
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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