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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 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 biotoxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1: preparing titanium nanotubes.

[0056] Take 0.83g nanometer TiO 2 Disperse in 80ml of NaOH solution with a concentration of 10mol / L, then transfer to a 100ml polytetrafluoroethylene liner and reactor, react at 130°C for 24h, and then soak the product in 500ml of hydrochloric acid solution with a concentration of 0.1mol / L , followed by washing with deionized water to pH=7, collecting by centrifugation, and drying at 80° C. for 6 hours to obtain titanium nanotubes.

[0057] Step 2: loading manganese oxide.

[0058] Disperse 1.29g of titanium nanotubes prepared in step 1 in 100ml of deionized water, and add 3.75mmol of Mn(AC) to the dispersion 2 4H 2 O and 5g of urea solid, stirred for 10min, the mixture was heated to 90°C, reacted on the reflux device for 2h, the product was washed with deionized water to pH = 7, collected by centrifugation, dried at 80°C for 6h, heated at 5°C / min, under air atmosphere , Calcined at 350°C for 2h to obtain titanium nanotubes lo...

Embodiment 2

[0065] Step 1: preparing titanium nanotubes.

[0066] Take 0.83g nanometer TiO 2 Disperse in 80ml of NaOH solution with a concentration of 10mol / L, then transfer to a 100ml polytetrafluoroethylene liner and reactor, react at 130°C for 24h, and then soak the product in 500ml of hydrochloric acid solution with a concentration of 0.1mol / L , followed by washing with deionized water to pH=7, collecting by centrifugation, and drying at 80° C. for 6 hours to obtain titanium nanotubes.

[0067] Step 2: loading manganese oxide.

[0068] Disperse 1.29g of titanium nanotubes prepared in step 1 in 100ml of deionized water, and add 3.75mmol of Mn(AC) to the dispersion 2 4H 2 O and 5g of urea solid, stirred for 10min, the mixture was heated to 90°C, reacted on the reflux device for 2h, the product was washed with deionized water to pH = 7, collected by centrifugation, dried at 80°C for 6h, heated at 5°C / min, under air atmosphere , Calcined at 350°C for 2h to obtain titanium nanotubes lo...

Embodiment 3

[0075] Step 1: preparing titanium nanotubes.

[0076] Take 0.83g nanometer TiO 2 Disperse in 80ml of NaOH solution with a concentration of 10mol / L, then transfer to a 100ml polytetrafluoroethylene liner and reactor, react at 130°C for 24h, and then soak the product in 500ml of hydrochloric acid solution with a concentration of 0.1mol / L , followed by washing with deionized water to pH=7, collecting by centrifugation, and drying at 80° C. for 6 hours to obtain titanium nanotubes.

[0077] Step 2: loading manganese oxide.

[0078] Disperse 1.29g of titanium nanotubes prepared in step 1 in 100ml of deionized water, and add 3.75mmol of Mn(AC) to the dispersion 2 4H 2 O and 5g of urea solid, stirred for 10min, the mixture was heated to 90°C, reacted on the reflux device for 2h, the product was washed with deionized water to pH = 7, collected by centrifugation, dried at 80°C for 6h, heated at 5°C / min, under air atmosphere , Calcined at 350°C for 2h to obtain titanium nanotubes lo...

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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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