Cerium-tungsten-tantalum denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as reducing the service life of denitrification catalysts, human health and ecological environment hazards, and easy loss of activity

Inactive Publication Date: 2018-03-20
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main active component vanadium compound is a kind of toxic substance, which will be dispersed into the surrounding environment during the use of the catalyst, thus causing harm to human health and the ecological environment
At the same time, the disposal of spent vanadium-based deni

Method used

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  • Cerium-tungsten-tantalum denitration catalyst and preparation method thereof
  • Cerium-tungsten-tantalum denitration catalyst and preparation method thereof
  • Cerium-tungsten-tantalum denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A cerium-tungsten-tantalum denitrification catalyst, in which the molar ratio of element cerium, element tungsten, and element tantalum is 2:4:1.

[0055] The preparation method of the above-mentioned cerium-tungsten-tantalum denitration catalyst comprises the following steps:

[0056] 1) First, mix and dissolve the cerium source and the tungsten source in water, and let it stand for 6 hours; then add the tantalum source and let it stand for 10 hours to obtain a mixed solution; the sampling of the cerium source, tungsten source, and tantalum source is shown in the following table:

[0057] Ce source

molecular weight

Weighing mass / g

Ce(NO 3 ) 3 ·6H 2 o

434.12

Ce(AC) 3 ·5H 2 o

407.28

Ce 2 (CO 3 ) 3 ·5H 2 o

550.33

550.33

Ce(SO 4 ) 2 4H 2 o

404.30

Ce(OH) 3

191.14

[0058] Tungsten source

molecular weight

Weighing mass / g

(NH 4 ) 5 W...

Embodiment 2

[0071] A cerium-tungsten-tantalum denitrification catalyst, in which the molar ratio of element cerium, element tungsten, and element tantalum is 5:1:4.

[0072] The preparation method of the above-mentioned cerium-tungsten-tantalum denitration catalyst comprises the following steps:

[0073] 1) First mix and dissolve the cerium source and the tungsten source in water, and let it stand for 12 hours; then add the tantalum source and let it stand for 8 hours to obtain a mixed solution; the sampling of the cerium source, tungsten source, and tantalum source is shown in the following table:

[0074] Ce source

molecular weight

Weighing mass / g

Ce(NO 3 ) 3 ·6H 2 o

434.12

434.12

Ce(AC) 3 ·5H 2 o

407.28

407.28

Ce 2 (CO 3 ) 3 ·5H 2 o

550.33

550.33

Ce(SO 4 ) 2 4H 2 o

404.30

404.30

Ce(OH) 3

191.14

[0075] Tungsten source

molecular weight

Weighing mass / g

...

Embodiment 3

[0088] A cerium-tungsten-tantalum denitrification catalyst, in which the molar ratio of element cerium, element tungsten, and element tantalum is 3:2:3.

[0089] The preparation method of the above-mentioned cerium-tungsten-tantalum denitration catalyst comprises the following steps:

[0090] 1) First mix and dissolve the cerium source and the tungsten source in water, and let it stand for 7 hours; then add the tantalum source and let it stand for 11 hours to obtain a mixed solution; the sampling of the cerium source, tungsten source, and tantalum source is shown in the following table:

[0091]

[0092]

[0093]

[0094]

[0095] 2) Adjust the pH of the mixed solution obtained in step 1) with urea solution, so that the pH value reaches 11; heat and stir; the heating temperature is 60° C., and the stirring time is 11 hours.

[0096] 3) Filter the mixed liquid obtained in step 2) to obtain mud; dry the filtered mud at 115° C. for 9 hours to obtain a block; grind the...

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PUM

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Abstract

The invention provides a cerium-tungsten-tantalum denitration catalyst. In the catalyst, the molar ratio of cerium to tungsten to tantalum is 2-5:1-4:1-4. A preparation method of the cerium-tungsten-tantalum denitration catalyst comprises the following steps: (1) firstly, mixing and dissolving a cerium source and a tungsten source in water, and then adding a tantalum source to obtain a mixed solution; (2) adjusting the pH of the mixed solution obtained in step (1) by using a weak base solution, so that the pH value reaches 9-11; (3) sequentially filtering, drying and grinding the mixed solution obtained in step (2) to prepare an active component; (4) mixing the active component obtained in step (3) with carrier powder, an assistant and water and uniformly mixing to obtain a paste stock; (5) performing extrusion molding on the paste stock obtained in step (4) to obtain a molding catalyst; (6) drying the molding catalyst obtained in step (5) to obtain a dried molding catalyst; and (7) calcining the dried molding catalyst obtained in step (6) to obtain the cerium-tungsten-tantalum denitration catalyst. The denitration catalyst prepared according to the invention is nonhazardous, highin activity and long in service life.

Description

technical field [0001] The invention relates to a selective catalytic reduction of nitrogen oxides (NO x ) catalyst and a preparation method thereof, in particular to a cerium-tungsten-tantalum denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, the problem of environmental pollution has become more and more prominent. The continuous smog weather in large areas of northern China has made people pay more attention to the control of atmospheric environmental pollution. NO x As one of the main causes of smog, it has been listed as a key air pollutant by the environmental protection department. Various purification NO x Advanced denitrification technology has been vigorously developed and applied. [0003] Selective catalytic reduction technology (SCR) is currently the most efficient denitrification technology, and its denitrification efficiency can reach more than 80%. The technical principle is: in the reducing agent NH 3 In...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56B01D53/90
CPCB01J23/30B01D53/8628B01D53/90B01D2258/0283
Inventor 陈勇胡建锋吴晓东吴新谦
Owner LONGYAN ZIJIN INNOVATION RES INST
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