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Low-temperature SCR smoke denitration catalyst of carbon nano tube load metallic oxide and preparation method thereof

A denitrification catalyst and metal-loaded technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem that the catalyst is easy to be washed and blocked by dust, and the service life is reduced etc. to achieve the effect of strong corrosion resistance, improved adsorption, and large specific surface area

Inactive Publication Date: 2014-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Catalysts are the key to SCR flue gas denitrification technology. At present, commercial SCR catalysts are mainly V 2 o 5 –WO 3 (MoO 3 ) / TiO 2 series of catalysts, the active temperature window is 300-400 ° C, due to the high temperature required, the SCR denitration device is generally placed before the dust removal and desulfurization device, so the catalyst is easily washed and blocked by dust, and the service life is reduced

Method used

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  • Low-temperature SCR smoke denitration catalyst of carbon nano tube load metallic oxide and preparation method thereof

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Effect test

Embodiment 1

[0030] (1) Pretreatment of carbon nanotubes: Weigh 1g of multi-walled carbon nanotubes into a conical flask, add 200ml of 3mol / L nitric acid solution, treat with ultrasonic waves for 30min, then bathe in water at 100°C for 4h, filter and wash with water until neutral. Dry at 110°C for 12h, then place the acid-treated multi-walled carbon nanotubes in a dielectric barrier discharge (DBD) reactor at 25ml / min O 2 In the atmosphere, discharge at 45KV for 40min. That is, pretreated multi-walled carbon nanotubes are obtained.

[0031] (2) ZrO 2 Preparation of / MWCNTs composite carrier: Weigh 0.33g of zirconyl nitrate and dissolve it in 20ml of absolute ethanol, and drop evenly into 1g of pretreated multi-walled carbon nanotubes. Ultrasonic treatment of the above mixed material for 30min, then drying in an ordinary blast drying oven at 60°C for 12h, and then drying in a tube furnace for N 2 Roasting at 400°C under atmosphere (heating rate 5°C / min, holding time 2h, ZrO 2 / MWCNTs co...

Embodiment 2

[0034] (1) Pretreatment of MWCNTs: Weigh 1g of multi-walled carbon nanotubes into a conical flask, add 200ml of 3mol / L nitric acid solution, treat with ultrasonic wave for 30min, then place in water bath at 100℃ for 4h, filter and wash with water until neutral, and 110℃ After drying for 12 h, the acid-treated MWCNTs were placed in a dielectric barrier discharge (DBD) reactor at 25 ml / min O 2 In the atmosphere, discharge at 45KV for 40min. That is, the pretreated MWCNTs are obtained.

[0035] (2) ZrO 2 Preparation of / MWCNTs composite carrier: Weigh 0.98g of zirconyl nitrate and dissolve it in 20ml of absolute ethanol, and drop evenly into 1g of pretreated multi-walled carbon nanotubes. Ultrasonic treatment of the above mixed material for 30min, then drying in an ordinary blast drying oven at 60°C for 12h, and then drying in a tube furnace for N 2 Roast at 400°C under atmosphere (heating rate 5°C / min, holding time 2h) to get ZrO 2 / MWCNTs composite carrier, in which ZrO 2 Th...

Embodiment 3

[0038] (1) Pretreatment of carbon nanotubes: Weigh 1g of multi-walled carbon nanotubes into a conical flask, add 200ml of 3mol / L nitric acid solution, treat with ultrasonic waves for 30min, then bathe in water at 100°C for 4h, filter and wash with water until neutral. Dry at 110°C for 12h, then place the acid-treated MWCNTs in a dielectric barrier discharge (DBD) reactor at 25ml / min O 2 In the atmosphere, discharge at 45KV for 40min. That is, pretreated multi-walled carbon nanotubes are obtained.

[0039] (2) ZrO 2 Preparation of / MWCNTs composite carrier: Weigh 1.63g of zirconyl nitrate and dissolve it in 20ml of absolute ethanol, and drop evenly into 1g of pretreated MWCNTs. Ultrasonic treatment of the above mixed material for 30min, then drying in an ordinary blast drying oven at 60°C for 12h, and then drying in a tube furnace for N 2 Roast at 400°C under atmosphere (heating rate 5°C / min, holding time 2h) to get ZrO 2 / MWCNTs catalyst, where ZrO 2 The ratio to the mass...

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Abstract

The invention belongs to the field of environmental protection and environmental catalysis, and in particular relates to a low-temperature SCR smoke denitration catalyst of a carbon nano tube load metallic oxide. The low-temperature SCR smoke denitration catalyst is characterized in that a multi-wall carbon nanotube is utilized as a carrier, ZrO2 is utilized as a sleep-assisting agent, MnOx is utilized as an active component, and a low-temperature smoke denitration catalyst based on a carbon nano tube is obtained. The low-temperature SCR smoke denitration catalyst provided by the invention has the advantages that a ZrO2 surface modification multi-wall carbon nanotube is adopted, a specific surface area, heat stability and acidity of the catalyst are increased, the denitration activity of the catalyst is improved through the interaction of the MnOx, the ZrO2 and the multi-wall carbon nanotube, the ammonia is utilized as a reducing agent, and the low-temperature SCR smoke denitration catalyst has the good catalytic activity when the temperature is 180-280 DEG C.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and in particular relates to a novel low-temperature SCR flue gas denitrification catalyst supported by metal oxides on carbon nanotubes. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants. In addition to directly endangering human health, it is also one of the important precursors for generating ozone, and is also an important cause of regional haze and fine particle pollution. Nitrogen oxides mainly come from the combustion of fossil fuels. According to statistics, 66.7% of the national industrial nitrogen oxides emissions come from the power and heat production and supply industries, which are the largest emitters of nitrogen oxides in my country. Among them, the thermal power industry’s nitrogen oxides contribute Therefore, the power industry is the key field for controlling nitrogen oxide emissions in my country. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 黄碧纯杨超
Owner SOUTH CHINA UNIV OF TECH
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