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

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Problems solved by technology

There are still no relevant reports on denitrification catalysts with stab

Method used

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  • Preparation method of denitration catalyst

Examples

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Example Embodiment

[0037] Example 1

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

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

Example Embodiment

[0040] Example 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 titanium tungsten powder prepared in Example 1 and mix and stir to form a slurry. After standing at room temperature for a period of time, dry at 100°C for 10 hours, and then dry at 400 Calcined at ℃ for 5 hours to obtain V 2 O 5 The content is 1wt.%, WO 3 The denitration catalyst with a content of 10 wt.% is denoted as A2 for activity evaluation.

Example Embodiment

[0043] Example 3

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

[0045] 1.5 g of ammonium metavanadate and 5 g of oxalic acid were dissolved in 700 mL of water, 100 g of the titanium tungsten powder prepared in Example 1 were added and mixed, and the mixture was hydrothermally reacted at 200° C. for 10 hours. After the hydrothermal reaction is over, the sample is 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 10 wt.% is denoted as A3 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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