MnO2-TiO2 carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material and its preparation method

A technology of inorganic ceramic membranes and carbon nanotubes is applied in chemical instruments and methods, separation methods, catalyst protection and other directions to increase the conversion rate, ensure long-term effective operation, and prevent the deposition of smoke and dust.

Active Publication Date: 2012-10-17
SHANXI PULI ENVIRONMENT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of existing denitrification catalysts, utilize the high specific surface area and porosity of inorganic ceramic membranes, the unique charge transport performance of carbon nanotubes and the self-cleaning function of fluorocarbon resin materials to provide a self-cleaning , a kind of MnO with high catalytic efficiency, corrosion resistance, high mechanical strength, stable structure without deformation and long service life 2 -TiO 2 Carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of MnO 2 -TiO 2 Carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material, the preparation method of which is as follows:

[0023] Step (1): The main component is SiO 2 、Al 2 o 3 , CaO, MgO, TiO 2 、K 2 O, Na 2 The cinder of O is ground to 0.06 mm~0.09 mm, 10 wt.% of charcoal with a particle size of 0.02 mm is added, and it is molded on a press with a semi-dry method at a molding pressure of 38 MPa, and pressed into φ10×5 mm The pressed flakes were calcined in a muffle furnace at 1100 oC for 2 h to obtain fly ash-based porous ceramic flakes, which were ground to a particle size of 0.1 mm–0.3 mm.

[0024] Step (2): At room temperature, put 0.310 g of carbon nanotubes into anhydrous ethanol, ultrasonically pulverize for 15 min, then add 35.570 g of n-butyl titanate after ordinary ultrasonic treatment for 15 min, and then ultrasonically treat for 30 min. 60 ml of 0.5 mol / L acetic acid and 3.790 g of Mn(...

Embodiment 2

[0029] A kind of MnO 2 -TiO 2 Carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material, the preparation method of which is as follows:

[0030] Step (1): The main component is SiO 2 、Al 2 o 3 , CaO, MgO, TiO2 、K 2 O, Na 2 The cinder of O is ground to 0.06 mm~0.09 mm, 10 wt.% of charcoal with a particle size of 0.02 mm is added, and it is molded on a press with a semi-dry method at a molding pressure of 38 MPa, and pressed into φ10×5 mm The flakes; the pressed flakes were calcined in a muffle furnace at 1100 oC for 2 h to obtain fly ash-based porous ceramic sheets, which were ground to a particle size of 0.1 mm to 0.3 mm.

[0031] Step (2): At room temperature, put 0.250 g of carbon nanotubes into absolute ethanol, ultrasonically pulverize for 15 min, then add 28.480 g of n-butyl titanate after ordinary ultrasonic treatment for 15 min, and then ultrasonically treat for 30 min. 48 ml of 0.5 mol / L acetic acid and 3....

Embodiment 3

[0036] A kind of MnO 2 -TiO 2 Carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material, the preparation method of which is as follows:

[0037] Step (1): The main component is SiO 2 、Al 2 o 3 , CaO, MgO, TiO 2 、K 2 O, Na 2 The cinder of O is ground to 0.06 mm~0.09 mm, 10 wt.% of charcoal with a particle size of 0.02 mm is added, and it is molded on a press with a semi-dry method at a molding pressure of 38 MPa, and pressed into φ10×5 mm The flakes; the pressed flakes were calcined in a muffle furnace at 1100 oC for 2 h to obtain fly ash-based porous ceramic sheets, which were ground to a particle size of 0.1 mm to 0.3 mm.

[0038] Step (2): At room temperature, put 0.120 g of carbon nanotubes into absolute ethanol, ultrasonically pulverize for 15 min, then add 14.240 g of n-butyl titanate after ordinary ultrasonic treatment for 15 min, and then ultrasonically treat for 30 min. 30 ml of 0.5 mol / L acetic acid and ...

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Abstract

A MnO2-TiO2 carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material and its preparation method belong to the field of low-temperature catalytic denitrification. A porous inorganic ceramic membrane is used as a carrier; a compound of MnO2, TiO2 and carbon nanotube is loaded on the surface of the carrier so as to obtain a catalyst; and a fluorocarbon resin material is loaded on the surface of the catalyst, wherein the mass percents of the fluorocarbon resin material and the catalyst itself are respectively 30% and 70%; in the catalyst, the mass percent of the porous inorganic ceramic membrane is 50-80%, and the mass percent of the compound of MnO2, TiO2 and graphene is 20-50%. As coal ash in a thermal power plant is used as a raw material and charcoal is used as a foaming agent to prepare the porous inorganic ceramic membrane, the price is low; as the porous inorganic ceramic membrane has a porous structure and large specific surface area, more active centers can be provided for catalytic reaction; the carbon nanotube has large specific surface area, high chemical inertness and tunnel conductivity of large delocalized pi bond, catalytic performance of the material at low temperature can be raised; and the fluorocarbon resin compound on the surface of the catalyst has a self-cleaning function.

Description

Technical field: [0001] The invention belongs to the field of low-temperature catalytic denitrification, in particular to a MnO 2 -TiO 2 A carbon nanotube-porous inorganic ceramic membrane low-temperature catalytic denitrification self-cleaning material and a preparation method thereof. Background technique: [0002] Nitrogen oxides emitted by power plant boiler systems are one of the main air pollutants that promote the formation of acid rain and the greenhouse effect. The nitrate ions and nitrite ions formed in the nitrogen oxides account for about 20% to 50% of the acidity. Selective Catalytic Reduction (SCR) technology is currently the most efficient and mature power plant flue gas denitrification technology, and has been widely used in domestic and foreign power plants. [0003] In order to reduce the influence of dust on the service life of the catalyst, the SCR system is often arranged after the dust collector, which is the so-called low fly ash arrangement. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J33/00B01D53/86B01D53/56
CPCY02C20/30
Inventor 董长青覃吴石司默高攀李继红杨勇平
Owner SHANXI PULI ENVIRONMENT ENG CO LTD
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