Denitration catalyst and preparation method thereof, and waste gas denitration method

A denitration catalyst and waste gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of accelerated catalyst, deactivation, etc., and achieve the effect of enhancing stability, easy operation, and improving dispersion ability.

Active Publication Date: 2021-09-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the commonly used V 2 o 5 -WO 3 (MoO 3 )/TiO 2 Catalyst, its working temperature is as high as 300-400°C, so the SCR device must be installed before dust removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example 1

[0055] Step a: preparation of the titanium nanotubes.

[0056] Take 0.83g of TiO 2 80ml dispersed in a concentration of 10mol / L NaOH solution, and then transferred to a 100ml Teflon-lined reaction vessel, the reaction at 130 ℃ 24h, after concentration of the product in 500ml 0.1mol / L hydrochloric acid solution soak , then deionized water to pH = 7, collected by centrifugation, dried at 80 ℃ 6h, to give a titanium nanotubes.

[0057] Step two: manganese oxide load.

[0058] The obtained 1.29g step a titanium nanotubes dispersed in 100ml of deionized water, was added 3.75mmol of Mn (AC) in the dispersion are 2 · 4h 2 Solid urea and O 5g, stirring 10min, the mixture was heated to 90 ℃, the reaction was refluxed for 2h in the apparatus, the product of deionized water to pH = 7, was collected by centrifugation, and dried 80 deg.] C 6h, 5 ℃ / min heated, under air atmosphere , 350 ℃ calcined 2h, to obtain a titanium loaded with manganese oxide nanotubes.

[0059] ...

Example Embodiment

[0064] Example 2

[0065] Step a: preparation of the titanium nanotubes.

[0066] Take 0.83g of TiO 2 80ml dispersed in a concentration of 10mol / L NaOH solution, and then transferred to a 100ml Teflon-lined reaction vessel, the reaction at 130 ℃ 24h, after concentration of the product in 500ml 0.1mol / L hydrochloric acid solution soak , then deionized water to pH = 7, collected by centrifugation, dried at 80 ℃ 6h, to give a titanium nanotubes.

[0067] Step two: manganese oxide load.

[0068] The obtained 1.29g step a titanium nanotubes dispersed in 100ml of deionized water, was added 3.75mmol of Mn (AC) in the dispersion are 2 · 4h 2 Solid urea and O 5g, stirring 10min, the mixture was heated to 90 ℃, the reaction was refluxed for 2h in the apparatus, the product of deionized water to pH = 7, was collected by centrifugation, and dried 80 deg.] C 6h, 5 ℃ / min heated, under air atmosphere , 350 ℃ calcined 2h, to obtain a titanium loaded with manganese oxide nanotubes.

[0069] ...

Example Embodiment

[0074] Example 3

[0075] Step a: preparation of the titanium nanotubes.

[0076] Take 0.83g of TiO 2 80ml dispersed in a concentration of 10mol / L NaOH solution, and then transferred to a 100ml Teflon-lined reaction vessel, the reaction at 130 ℃ 24h, after concentration of the product in 500ml 0.1mol / L hydrochloric acid solution soak , then deionized water to pH = 7, collected by centrifugation, dried at 80 ℃ 6h, to give a titanium nanotubes.

[0077] Step two: manganese oxide load.

[0078] The obtained 1.29g step a titanium nanotubes dispersed in 100ml of deionized water, was added 3.75mmol of Mn (AC) in the dispersion are 2 · 4h 2 Solid urea and O 5g, stirring 10min, the mixture was heated to 90 ℃, the reaction was refluxed for 2h in the apparatus, the product of deionized water to pH = 7, was collected by centrifugation, and dried 80 deg.] C 6h, 5 ℃ / min heated, under air atmosphere , 350 ℃ calcined 2h, to obtain a titanium loaded with manganese oxide nanotubes.

[0079] ...

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Abstract

The invention provides a denitration catalyst and a preparation method thereof, and a waste gas denitration method, belonging to the field of waste gas treatment. The denitration catalyst comprises a core layer, a middle layer and a shell layer, wherein the core layer comprises titanium nanotubes, the middle layer comprises manganese oxide, and the shell layer comprises iron oxide. The preparation method of the denitration catalyst comprises the following steps: subjecting a manganese oxide precursor to reacting with the titanium nanotubes to obtain the titanium nanotubes loaded with the manganese oxide, and then modifying the titanium nanotubes loaded with the manganese oxide by using an iron source to obtain the denitration catalyst. According to the waste gas denitration method, waste gas denitration is carried out by using the denitration catalyst. The denitration catalyst provided by the invention has higher stability, activity, selectivity and sulfur resistance; raw materials used in the preparation method are environment-friendly and easily available, operation is simple and controllable, and expanded production is facilitated; and when the denitration catalyst is used for denitration treatment of waste gas, a denitration rate is high, selectivity is good, and stability is high.

Description

technical field [0001] The invention relates to the field of waste gas treatment, in particular to a denitration catalyst, a preparation method thereof and a waste gas denitration method. Background technique [0002] NO in iron and steel, nonferrous metals, building materials, coking, petrochemical and other industries x The air pollution caused by the emissions cannot be ignored. At present, the use of catalysts and other substances to denitrify the exhaust gas is a common and effective purification method. [0003] However, the commonly used V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalyst, its working temperature is as high as 300-400°C, so the SCR device must be installed before dust removal and desulfurization, and the working environment with high dust and high sulfur will definitely accelerate the deactivation of the catalyst, and the active component V 2 o 5 Biologically toxic. [0004] Based on the above problems, it is of great significance to research and develop n...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J21/06B01D53/86B01D53/56
CPCB01J23/8892B01J21/063B01D53/8628
Inventor 黄张根李一凡侯亚芹韩小金
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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