Low-temperature selective catalytic reduction denitration catalyst and preparation method thereof

A denitrification catalyst and selective technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing catalyst service life, catalyst bed wear, low temperature Insufficient activity and other problems, to achieve the effect of improving surface properties, improving dispersion, and large specific surface area

Inactive Publication Date: 2016-12-14
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional vanadium-based catalysts have insufficient low-temperature activity
The SCR method is the mainstream flue gas denitrification technology that has been successfully commercialized at present, and the denitrification catalyst is the core of this technology. Catalyst poisoning occurs due to the influence of SO2 and dust, followed by the high temperature (300-400°C) required for the catalyst to achieve the best activity, so the SCR device is often arranged before the dust removal and desulfurization device, so that the dust in the flue gas will Wear and block the catalyst bed, reducing the service life of the catalyst

Method used

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  • Low-temperature selective catalytic reduction denitration catalyst and preparation method thereof

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preparation example Construction

[0018] The present invention uses multi-walled carbon nanotubes as the carrier, FeO x As a cocatalyst, MnO x As an active component, a low-temperature flue gas denitrification catalyst based on carbon nanotubes is obtained. The preparation method is to firstly treat the carrier with nitric acid vapor, and then adopt the equal volume impregnation method to prepare the catalyst, which specifically includes the following steps: 1) firstly, pretreat the multi-walled carbon nanotubes, use nitric acid vapor to treat, then wash with water, and wash with alcohol , drying to obtain pretreated multi-walled carbon nanotubes; 2) adding the pretreated multi-walled carbon nanotubes obtained in step 1) into a mixed solution of manganese acetate and ferric nitrate, and ultrasonically treating them for 30-180min, so that Manganese acetate and ferric nitrate are uniformly dispersed in the solvent, and are impregnated with equal volumes for 10-48 hours; 3) After drying the mixture obtained in s...

Embodiment 1

[0023] Put 5ml of nitric acid aqueous solution (3mol / L) in a 50ml high-temperature hydrothermal kettle, place about 1g of carbon nanotubes on the upper part of a sand core crucible, place the crucible in a high-temperature hydrothermal kettle, and finally place the hydrothermal kettle in an oven , the oven temperature was set at 180°C, and after 5 hours, the hydrothermal kettle was cooled to room temperature, and the carbon nanotubes were taken out, washed with water and alcohol, and dried at 80°C for 5 hours to obtain modified multi-walled carbon nanotubes. Then the MnOx-FeOx / MWCNTs catalyst was prepared by equal volume impregnation method. Weighed 0.31g manganese acetate and 0.433g ferric nitrate nonahydrate to prepare 40ml solutions respectively, added to the pretreated MWCNTs, ultrasonically dispersed for 1h, and soaked at room temperature for about 12h . After the mixture was dried at 80°C, it was calcined in a tube furnace at 400°C for 2h under a nitrogen atmosphere. Fina...

Embodiment 2

[0025] Put 10ml of nitric acid aqueous solution (3mol / L) in a 50ml high-temperature hydrothermal kettle, place about 1g of carbon nanotubes on the upper part of a sand core crucible, place the crucible in a high-temperature hydrothermal kettle, and finally place the hydrothermal kettle in an oven , the oven temperature was set at 150°C, and after 5 hours, the hydrothermal kettle was cooled to room temperature, and the carbon nanotubes were taken out, washed with water and alcohol, and dried at 80°C for 5 hours to obtain modified multi-walled carbon nanotubes. Then the MnOx-FeOx / MWCNTs catalyst was prepared by the equal volume impregnation method. Weighed 0.155g manganese acetate and 0.361g ferric nitrate nonahydrate to prepare 40ml solutions respectively, added to the pretreated MWCNTs, ultrasonically dispersed for 1h, and soaked at room temperature for about 12h .After the mixture was dried at 80°C, it was calcined in a tube furnace at 400°C for 2h under a nitrogen atmosphere....

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Abstract

The invention relates to a low-temperature selective catalytic reduction denitration catalyst and a preparation method of the catalyst. The denitration catalyst is composed of an active component, a catalysis promoter and a carrier, wherein a multiwalled carbon nanotube is used as the carrier, FeOx is used as the catalysis promoter, and MnOx is used as the active component. The preparation method comprises the steps that the carrier is subjected to nitric acid steam treatment, then, an incipient-wetness impregnation method is adopted for preparing the catalyst, the multiwalled carbon nanotube is modified through nitric acid steam, hydrophilia of the carbon nnaotube is improved, meanwhile, the specific area of the catalyst is increased, even dispersion of the active component on the surface of the carrier is promoted, the denitration activity of the catalyst is improved through interaction among MnOx, FeOx and the multiwalled carbon nanotube, ammonia is used as a reducing agent, and good catalysis activity is shown within the temperature range from 180 DEG C to 240 DEG C. The low-temperature selective catalytic reduction denitration catalyst have the advantages that operation saves time and is easy, the cost is saved, and environment is protected; by means of the catalyst, and an SCR denitration system can efficiently remove NOx in flue gas at low temperature.

Description

[technical field] [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a low-temperature selective catalytic reduction denitrification catalyst and a preparation method thereof. [Background technique] [0002] With the increasing development of the economy, my country's consumption of coal and the environmental pollution problems it brings are increasing day by day. The direct / indirect emissions of coal-fired exhaust, mainly nitrogen oxides (NOx), can not only cause environmental problems such as acid rain, photochemical smog, and ozone layer destruction, but also pose certain threats to human health. Therefore, the damage to the atmosphere caused by NOx emitted from coal combustion has become an environmental problem that cannot be ignored. Effectively controlling and reducing NOx emissions has become the focus of improving air pollution. [0003] At present, ammonia selective catalytic reduction technology (NH...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/8892B01D53/8628B01D2258/0283B01J23/002
Inventor 郑义吕欣占升王宇峰李珍
Owner SHANGHAI INST OF TECH
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