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Method for simultaneously removing N2O and NO

A removal and integration technology, applied in the field of removal of N2O and NOx, can solve the problems of complex process, large investment in equipment and materials, and achieve the effect of simple process, saving equipment investment and simplified operation.

Active Publication Date: 2016-11-09
阳煤集团深州化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally for N 2 O and NO x The removal can be considered according to N 2 O and NO x Different properties of different catalysts are used to remove respectively, such as N 2 O adopts catalytic decomposition catalyst, NO x The use of denitrification catalysts through selective catalytic reduction by adding reducing agents, but the process is more complicated, equipment and material investment is large, and there is no simultaneous removal of N in the current prior art 2 O and NO x method report

Method used

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  • Method for simultaneously removing N2O and NO
  • Method for simultaneously removing N2O and NO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The catalyst is produced according to the following preparation process

[0043] (1) Impregnation: 10 grams of ammonium metavanadate and 5 grams of cobalt oxalate were added to 60 milliliters of ammonia solution in a volume ratio of 1:10, dissolved completely, and the solution was impregnated on 100 grams of alumina carrier in equal amounts.

[0044] (2) Drying: the impregnated alumina carrier is dried in the shade and then dried by hot air at 120°C.

[0045] (3) Roasting: The semi-finished product after drying is roasted at 550°C to fully decompose the salt.

[0046] (4) secondary dipping: after the semi-finished product after roasting is naturally cooled, 1.6 grams of palladium chloride is dissolved in 60 milliliters of 1:10 hydrochloric acid solution in a volume ratio, and the dissolution is complete, and the solution is immersed in the carrier of step (3) in equal amounts superior.

[0047] (5) Reduction of precious metals: The carrier impregnated with precious me...

Embodiment 2

[0053] The catalyst is produced according to the following preparation process

[0054] (1) Impregnation: 14 grams of copper acetate monohydrate and 8 grams of zinc acetate dihydrate were added to 60 ml of acetic acid solution in a volume ratio of 1:10, and the solution was completely dissolved, and the solution was impregnated on 100 grams of alumina carrier in equal amounts.

[0055] (2) Drying: the impregnated alumina carrier is dried in the shade and then dried by hot air at 120°C.

[0056] (3) Roasting: The semi-finished product after drying is roasted at 450°C to fully decompose the salt.

[0057] (4) Secondary immersion: after the semi-finished product after roasting is naturally cooled, 5.2 grams of chloroplatinic acid is dissolved in 60 ml of a hydrochloric acid solution with a volume ratio of 1:10, the dissolution is complete, and the solution is immersed in the carrier of step (3) in equal amounts. superior.

[0058] (5) Reduction of precious metals: The carrier i...

Embodiment 3

[0064] The catalyst is produced according to the following preparation process

[0065] (1) Impregnation: 6 grams of ammonium metavanadate and 3.5 grams of copper acetate were added to 60 milliliters of ammonia solution with a volume ratio of 1:10, and the solution was completely dissolved, and the solution was impregnated on 100 grams of alumina carrier in equal amounts.

[0066] (2) Drying: the impregnated alumina carrier is dried in the shade and then dried by hot air at 120°C.

[0067] (3) Roasting: The semi-finished product after drying is roasted at 550°C to fully decompose the salt.

[0068] (4) Secondary impregnation: after the semi-finished product after roasting is naturally cooled, 13.7 grams of rhodium nitrate is dissolved in 60 milliliters of water, and the dissolution is complete, and the solution is impregnated on the carrier of step (3).

[0069] (5) Reduction of precious metal: The carrier impregnated with precious metal uses ascorbic acid as a reducing agent...

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Abstract

The invention relates to a method for simultaneously removing N2O and NOx. The method is as below: supplementing NH3 and air to the treated gas containing N2O and NOx; sending the treated gas at 200-600 DEG C into a special catalyst bed capable of integrally removing N2O and NOx, and simultaneously removing N2O and NOx in the treated gas, wherein N2O is catalyzed and decomposed into N2 and O2, NOx reacts with the added NH3 and N2 in the presence of the catalyst. The catalyst bed capable of integrally removing N2O and NOx comprises 0.1-5 wt.% of precious metals, 3-15 wt.% of transition metal oxides, 0.5%-1% of alkali metal hydroxide and the balance of an alumina carrier. Compared to the adoption of different catalysts for removal of N2O and NOx in the commonly used combined method for removal of N2O and NOx, the method provided by the invention employs simultaneous removal of N2O and NOx, has the advantages of simple process, saving of equipment investment and simple operation, and can simultaneously remove N2O and NOx at low temperature of 200-600 DEG C and reach removal rate of higher than 95%.

Description

technical field [0001] The present invention relates to the removal of N 2 O and NO x The technical field, especially relates to a simultaneous removal of N 2 O and NO x Methods. Background technique [0002] Nitrogen oxide waste gas is usually produced in the production process of nitric acid, fatty acid, caprolactam, acrylonitrile, alkyl oxalate, etc., mainly containing N 2 O, NO, NO 2 , N 2 O 3 , N 2 O 4 , where N 2 O is a colorless and sweet gas with narcotic effect, also known as nitrous oxide, which has both the greenhouse effect and the destruction of the ozone layer. N 2 O is more likely to cause global warming than CO 2 310 times higher than the current atmospheric N 2 The concentration of O is about 310 nmol / mol and increases at a rate of about 0.2 to 0.3% per year. Its development trend poses a great threat to the human living environment, and it is also one of the gases that is clearly regulated in the Kyoto Protocol. [0003] NO x It directly harms...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01J23/89
CPCY02C20/10B01D53/8628B01J23/002B01J23/8926B01J23/8953B01J23/898B01J2523/00B01J2523/12B01J2523/31B01J2523/55B01J2523/845B01J2523/17B01J2523/27B01J2523/13
Inventor 李伟雷军
Owner 阳煤集团深州化工有限公司
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