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A preparing method of a catalyst for low-temperature denitrification

A low-temperature denitration and catalyst technology, which is applied in the field of low-temperature denitration catalyst preparation, can solve the problems of difficulty in emission reduction, increased energy consumption and equipment investment, etc., and achieves the effects of high selectivity, improved selectivity and good activity.

Inactive Publication Date: 2016-04-27
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the temperature of the flue gas is in the range of 120-300°C, which is far lower than the active temperature range of the SCR catalyst, and since there is no mature low-temperature SCR treatment technology in my country, it is necessary to use a complex heat exchanger system to apply the SCR technology, which increases energy consumption and equipment investment, resulting in NO x Difficulty in reducing emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Stir 0.05Kg ammonium paratungstate hydrate, 1Kg oxalic acid, and 2Kg deionized water with a constant temperature magnetic stirrer for 1 hour to completely dissolve the solids to form solution X1. During the stirring process, the material temperature is controlled at 50°C, and the solution X1 is left to stand for 1 hour for use; Wherein the ammonium paratungstate hydrate is preferably ammonium paratungstate undecahydrate, and its molecular formula is 5(NH 4 ) 2 O·12WO 3 11H 2 O.

[0040] (2) Stir 0.05Kg ammonium metavanadate, 0.5Kg monoethanolamine, and 1Kg deionized water with a constant temperature magnetic stirrer for 1 hour to completely dissolve the solids to form a solution X2. During the stirring process, the material temperature is controlled at 50°C, and the solution X2 is left to stand for 1 hour stand-by.

[0041] (3) Stir 0.05Kg ammonium heptamolybdate, 0.5Kg monoethanolamine, and 1Kg deionized water with a constant temperature magnetic stirrer for 1 ...

Embodiment 2

[0052] (1) Stir 2.9Kg ammonium paratungstate hydrate, 2.1Kg oxalic acid, and 4Kg deionized water with a constant temperature magnetic stirrer for 1.5 hours to completely dissolve the solids to form a solution X1. During the stirring process, the material temperature is controlled at 65°C, and the solution X1 is left to stand for 1.5 hours Stand-by; wherein ammonium paratungstate hydrate is preferably ammonium paratungstate undecahydrate, and its molecular formula is 5(NH 4 ) 2 O·12WO 3 11H 2 O.

[0053] (2) Stir 3.6Kg ammonium metavanadate, 2.5Kg monoethanolamine, and 2Kg deionized water with a constant temperature magnetic stirrer for 1.5 hours to completely dissolve the solids to form a solution X2. During the stirring process, the material temperature is controlled at 65°C, and the solution X2 is left standing 1.5h standby.

[0054] (3) Stir 3.6Kg ammonium heptamolybdate, 2.5Kg monoethanolamine, and 2Kg deionized water with a constant temperature magnetic stirrer for 1....

Embodiment 3

[0065] (1) Stir 5.6Kg ammonium paratungstate hydrate, 3.5Kg oxalic acid, and 5Kg deionized water with a constant temperature magnetic stirrer for 2.5 hours to completely dissolve the solids to form a solution X1. During the stirring process, the material temperature is controlled at 72°C, and the solution X1 is left to stand for 2.5 hours Stand-by; wherein ammonium paratungstate hydrate is preferably ammonium paratungstate undecahydrate, and its molecular formula is 5(NH 4 ) 2 O·12WO 3 11H 2 O.

[0066] (2) Stir 5.8Kg ammonium metavanadate, 5.1Kg monoethanolamine, and 5Kg deionized water with a constant temperature magnetic stirrer for 2.5 hours to completely dissolve the solids to form a solution X2. During the stirring process, the material temperature is controlled at 72°C, and the solution X2 is left standing 2.5h standby.

[0067] (3) Stir 4.9Kg ammonium heptamolybdate, 5.1Kg monoethanolamine, and 5Kg deionized water with a constant temperature magnetic stirrer for 2....

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Abstract

The invention relates to a preparing method of a catalyst for low-temperature denitrification, and belongs to the field of flue gas denitrification. The denitrification efficiency of the catalyst for flue gas at 150-420 DEG C is 95% or above. Raw materials for preparing the catalyst comprise 55-91 parts of superfine titanium dioxide, 1-10 parts of lanthanum nitrate, 1-5 parts of polyoxyethylene, 1-10 parts of cerous nitrate, 1-10 parts of zirconium nitrate, 0.05-10 parts of ammonium metavanadate, 0.05-15 parts of ammonium heptamolybdate, 0.05-10 parts of ammonium paratungstate, 1-5 parts of carboxymethylcellulose, 10-30 parts of deionized water, 1-15 parts of monoetanolamine and 1-5 parts of oxalic acid. The catalyst is characterized by high selectivity, high activity and strong poison resistance.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature denitrification catalyst, belonging to the technical field of flue gas denitrification. Background technique [0002] Nitrogen oxides (NO x ), will not only cause a series of environmental pollution, such as destruction of the ozone layer, acid rain, greenhouse effect, photochemical smog, etc., but also harm plant growth and cause human respiratory diseases. NO x The sources of emissions are mainly from electricity and heat production and supply industries. In recent years due to NO x The social problems caused by emissions are becoming more and more significant, and the State Environmental Protection Agency has x Emission reduction has put forward more stringent requirements, as the country's NO x Emission standards are getting higher and higher. According to the requirements of the "National Environmental Protection "Twelfth Five-Year" Plan", my country's nitrogen oxide emissions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J31/36B01D53/86B01D53/56
CPCB01J23/30B01D53/8628B01D2258/0283B01J23/002B01J31/36B01J2523/00B01J2523/3706B01J2523/3712B01J2523/47B01J2523/48B01J2523/55B01J2523/69B01J2523/68
Inventor 王光应刘江峰徐辉
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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