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Catalyst for integrated removal of N2O and NOx and preparation method thereof

A catalyst and removal technology, applied in the field of N2O and NOx removal, can solve the problems of large investment in equipment and materials, complex process, etc., and achieve the effect of ensuring stability, good load, and inhibiting catalytic denitrification activity

Active Publication Date: 2016-10-12
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 Selective catalytic reduction by adding a reducing agent using a denitrification catalyst, but the process is more complicated and the investment in equipment and materials is large

Method used

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  • Catalyst for integrated removal of N2O and NOx and preparation method thereof
  • Catalyst for integrated removal of N2O and NOx and preparation method thereof
  • Catalyst for integrated removal of N2O and NOx and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Catalysts are produced by the following preparation process

[0039] (1) Impregnation: Add 10 grams of ammonium metavanadate and 5 grams of cobalt oxalate into 60 milliliters of ammonia solution with a volume ratio of 1:10, dissolve completely, and impregnate 100 grams of the solution on the alumina support in equal amounts.

[0040] (2) Drying: The impregnated alumina carrier is dried in the shade and then dried with hot air at 120°C.

[0041] (3) Roasting: The semi-finished product after drying is roasted at 550°C to fully decompose the salt.

[0042] (4) Secondary impregnation: After the semi-finished product after roasting is naturally cooled, dissolve 1.6 grams of palladium chloride into 60 milliliters of hydrochloric acid solution with a volume ratio of 1:10, dissolve completely, and impregnate the solution into the carrier of step (3) in equal amounts superior.

[0043] (5) Noble metal reduction: The carrier impregnated with the noble metal uses potassium boroh...

Embodiment 2

[0049] Catalysts are produced by the following preparation process

[0050] (1) Impregnation: Add 14 grams of copper acetate monohydrate and 8 grams of zinc acetate dihydrate into 60 ml of acetic acid solution with a volume ratio of 1:10, dissolve completely, and impregnate 100 grams of the alumina carrier in equal amounts.

[0051] (2) Drying: The impregnated alumina carrier is dried in the shade and then dried with hot air at 120°C.

[0052] (3) Roasting: The semi-finished product after drying is roasted at 450°C to fully decompose the salt.

[0053] (4) Second impregnation: After the semi-finished product after roasting is cooled naturally, dissolve 5.2 grams of chloroplatinic acid into 60 ml of hydrochloric acid solution with a volume ratio of 1:10, dissolve completely, and impregnate the solution into the carrier of step (3) in equal amounts superior.

[0054] (5) Noble metal reduction: the carrier impregnated with the noble metal uses sodium hypophosphite as a reducing...

Embodiment 3

[0060] Catalysts are produced by the following preparation process

[0061] (1) Impregnation: Add 6 grams of ammonium metavanadate and 3.5 grams of copper acetate to 60 milliliters of ammonia solution with a volume ratio of 1:10, dissolve completely, and impregnate 100 grams of the solution on the alumina support in equal amounts.

[0062] (2) Drying: The impregnated alumina carrier is dried in the shade and then dried with hot air at 120°C.

[0063] (3) Roasting: The semi-finished product after drying is roasted at 550°C to fully decompose the salt.

[0064] (4) Secondary impregnation: After the semi-finished product after the roasting is naturally cooled, 13.7 grams of rhodium nitrate are dissolved in 60 milliliters of water, and the dissolution is complete, and the solution is equally impregnated on the carrier of step (3).

[0065] (5) Noble metal reduction: the carrier impregnated with the noble metal uses ascorbic acid as a reducing agent to undergo a liquid phase reduc...

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Abstract

The invention relates to a catalyst for integrated removal of N2O and NOx and a preparation method thereof. According to the mass percentage, the finished product catalyst comprises 0.1%-5% of a noble metal, 3%-15% of a transition metal oxide, 0.5%-1% of an alkali metal hydroxide, and the balance an alumina carrier. Through cooperative use of the three components of the noble metal, the transition metal oxide and the alkali metal hydroxide, catalytic properties of the noble metal and the transition metal oxide are in synergistic utilization, at the same time, presence of the alkali metal hydroxide can cause adsorption blocking of ammonia on the noble metal surface, and then ammonia oxidation and denitrification activity of the noble metal are affected, so that the noble metal is inhibited from oxidation of ammonia through addition of the alkali metal hydroxide, catalytic denitrification activity of the noble metal is inhibited, and the purposes of relatively well catalytic decomposition of N2O and denitrification under conditions of low temperature (200 to 600 DEG C) are achieved.

Description

technical field [0001] The present invention relates to N 2 O and NO x Removal technical field, especially relate to a kind of simultaneous removal of N 2 O and NO x Catalysts and their preparation methods. It can be used as nitrogen-containing 2 O and NO x (NO x means without N 2 O nitrogen oxides) exhaust gas treatment catalyst. Background technique [0002] Nitric acid, fatty acid, caprolactam, acrylonitrile, alkyl oxalate and other production processes usually produce nitrogen oxide waste gas, mainly containing N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 , where N 2 O is a colorless, sweet-smelling gas with narcotic effect, also known as laughing gas, which has both greenhouse effect and ozone layer depletion effect, N 2 O has a greater global warming potential than CO 2 310 times higher than current atmospheric N 2 The concentration of O is about 310nmol / mol, and it increases at a rate of about 0.2-0.3% per year. Its development trend poses a great threat to th...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01D53/86B01D53/56
CPCY02C20/10B01J23/898B01D53/8628B01J23/8946B01J23/8953
Inventor 雷军刘华伟王先厚孔渝华
Owner HAISO TECH
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