Machine-made composite oxide low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and composite technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of lower denitrification rate, denitrification activity needs to be improved, catalyst process complexity, etc., to achieve the preparation process Simple, excellent low-temperature denitrification performance, large specific surface area effect

Inactive Publication Date: 2018-06-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated to prepare the catalyst, and the modified coating material will reduce the NO x denitrification rate
Catalyst NH prepared by this method 3 -SCR denitrification activity needs to be improved

Method used

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  • Machine-made composite oxide low-temperature denitration catalyst and preparation method thereof
  • Machine-made composite oxide low-temperature denitration catalyst and preparation method thereof
  • Machine-made composite oxide low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Configure the precursor solution: according to the CeO in the catalyst 2 20% by weight, TiO 2 The weight ratio accounts for 80%, and a certain mass of Ce(NO 3 ) 3 ·6H 2 O and [Ti(SO 4 ) 2 ] Dissolve it completely with deionization to obtain a precursor mixed solution, and the solute mass fraction of the precursor mixed solution is controlled at 36%;

[0048] (2) Configure coprecipitation reaction bottom solution: measure a certain volume of NH with pH=10 4 Cl-NH 3 ·H 2 0 buffer solution, take a certain quality polyethylene glycol 600, use deionized water to make polyethylene glycol 600 into a solution, mix with the buffer solution to obtain the bottom solution of the precipitation reaction;

[0049] (3) Co-precipitation: Place the co-precipitation reaction bottom solution in a water bath at 40°C for preheating. When the co-precipitation reaction bottom solution reaches the specified temperature, mix ammonia water with a volume mass fraction of 25% and the pr...

Embodiment 2～6

[0058] By adopting the method of Example 1 and changing some parameters, a mechanism composite oxide low-temperature denitrification catalyst was obtained. The changed parameters are shown in Table 1, the test results of specific surface area, pore diameter, pore volume and weight loss on ignition are shown in Table 2, and the test results of the denitrification rate are shown in Table 3.

[0059] Table 1

[0060]

[0061] Table 2

[0062] Example number

Specific surface area (m 2 g -1 )

Aperture (nm)

Pore ​​volume (cm 3 g -1 )

Ignition weight loss rate (%)

Example 1

171.1

15.7

0.327

4.6

Example 2

162.6

14.6

0.398

2.6

Example 3

151.5

15.9

0.347

3.7

Example 4

183.6

16.7

0.423

2.7

Example 5

168.7

14.3

0.41

3.9

Example 6

152.2

15.9

0.387

3.2

[0063] table 3

[0064] Example number

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PUM

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Abstract

The invention discloses a machine-made composite oxide low-temperature denitration catalyst and a preparation method thereof and belongs to the field of air pollution control technique and industrialcatalysis. According to the catalyst, titanium sulfate and cerium nitrate hexahydrate are used as precursors; a CeO2-TiO2 composite oxide catalyst with different CeO2 contents is prepared by a co-precipitation method; according to the CeO2-TiO2 composite oxide catalyst, the mass content of cerium dioxide is 5-85%, and the mass content of titanium dioxide is 15-95%. A denitration activity detectionmethod of the catalyst comprises the following steps: charging the catalyst in a fixed-bed reactor, controlling the reaction temperature to be 140-280 DEG C, and taking ammonia gas as a reducing agent. When the air speed is 100000 / h<-1>, the denitration rate of the prepared CeO2-TiO2 composite oxide catalyst in a temperature range of 180-280 DEG C reaches up to 81-94%; the low-temperature denitration catalyst is safe, non-toxic and environmentally friendly.

Description

technical field [0001] The invention relates to a mechanism compound oxide low-temperature denitrification catalyst and its preparation method and the selective catalytic reduction of nitrogen oxides (NO) under oxygen-rich process conditions using the catalyst x )Methods. It is suitable for the elimination of nitrogen oxides emitted by fixed sources such as coal-fired power plants, thermal power plants, and smelting industries, and belongs to the field of air pollution control technology and industrial catalysis. Background technique [0002] Nitrogen oxide is one of the main pollutants in the atmosphere, and its emission will cause a series of serious environmental pollution problems, such as: acid rain, the hole in the ozone layer, photochemical smog, etc. NH 3 Selective catalyst reduction technology (NH 3 -SCR) is the mainstream technology for controlling stationary source nitrogen oxide pollution. The core of this technology is the SCR catalyst, and the commonly used ...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01J23/002B01D53/8628B01J23/10B01J37/031B01J37/08
Inventor 郭龙龙钟圣俊
Owner NORTHEASTERN UNIV
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