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Activated carbon/carbon nanotube composite material, preparation method thereof, catalyst and application of catalyst

A technology of composite materials and carbon nanotubes, applied in the direction of physical/chemical process catalysts, catalyst supports, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as high cost, complex catalyst components, and complicated preparation processes , to achieve the effect of low cost, superior sulfur resistance, and overcoming large bed resistance

Inactive Publication Date: 2020-12-01
SICHUAN UNIV
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Problems solved by technology

[0004] Chinese patent application CN108579731A discloses a method for preparing a carbon-based catalyst for low-temperature denitrification, which involves impregnation in strong acid solutions (concentrated nitric acid and concentrated sulfuric acid), and subsequent spraying and washing. The preparation process is complicated, and the denitrification effect remains to be seen. Further improve
Compared with the traditional technology, this method has greatly improved the function of synergistic desulfurization and denitrification, but the catalyst components are complex, and the problem of biological toxicity of vanadium pentoxide cannot be avoided
Chinese patent application CN109465006A discloses a 2 The modified activated carbon fiber is used as a composite carrier. The catalyst prepared by this method uses carbon fiber as a carrier, which is expensive, and the low-temperature denitrification rate of the catalyst is low, which is difficult to meet the current low-temperature denitrification requirements.

Method used

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  • Activated carbon/carbon nanotube composite material, preparation method thereof, catalyst and application of catalyst
  • Activated carbon/carbon nanotube composite material, preparation method thereof, catalyst and application of catalyst

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preparation example Construction

[0045] The preparation method of activated carbon / carbon nanotube composite material comprises the steps:

[0046] The pretreated activated carbon is heat-treated in a methane atmosphere; the temperature of the heat treatment is 400-900° C., and the time of the heat treatment is more than 10 minutes;

[0047] Wherein, the pretreatment method includes: immersing activated carbon in an aqueous solution containing nickel salt and then drying.

[0048] In the invention, nickel is used as a catalyst active component for growing carbon nanotubes, methane is used as a carbon source, and activated carbon / carbon nanotube composite materials are generated by cracking methane on Ni / activated carbon under high temperature conditions.

[0049] The preparation method of the present invention grows carbon nanotubes in situ on the activated carbon, which can make the carbon nanotubes grow uniformly in the pores of the activated carbon and on the inner and outer surfaces, and overcomes the dif...

Embodiment 1

[0085] The present embodiment provides the preparation method of activated carbon / carbon nanotube composite material, comprises the following steps:

[0086] (1) Dissolve 2.5 parts by weight of nickel nitrate in 20 parts by weight of deionized water to obtain an aqueous solution of nickel nitrate; then add 10 parts by weight of activated carbon to the prepared aqueous solution of nickel nitrate to obtain a mixed material; subsequently, the mixed material Ultrasonic at 150W for 30min, then oscillated at 150r / min for 12h in an oscillating box at 25°C; the shaken material was left at 25°C for 12h, then dried in an oven at 80°C to obtain pretreated Activated carbon, spare.

[0087] (2) the pretreated gac that step (1) obtains is placed in high-temperature furnace, under N 2 In the atmosphere, the temperature was raised to 750°C at a rate of 10°C / min and kept for 2 hours, and then the N 2 Atmosphere switched to CH 4 atmosphere, after 30min, the CH 4 Atmosphere switch to N 2 Th...

Embodiment 2

[0089] The present embodiment refers to the preparation method of Example 1, the difference is only in:

[0090] (2) the pretreated gac that step (1) obtains is placed in high-temperature furnace, under N 2 In the atmosphere, the temperature was raised to 750°C at a rate of 10°C / min and kept for 2 hours, and then the N 2 Atmosphere switched to CH 4 Atmosphere, after 90min, the CH 4 Atmosphere switch to N 2 The atmosphere was cooled to room temperature and taken out to obtain an activated carbon / carbon nanotube composite material.

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Abstract

The invention relates to the technical field of carbon-based low-temperature denitration catalysts, and especially relates to an activated carbon / carbon nanotube composite material, a preparation method thereof, a catalyst and application of the catalyst. The preparation method of the activated carbon / carbon nanotube composite material comprises the following step: carrying out heat treatment on pretreated activated carbon in a methane atmosphere, wherein the temperature of the heat treatment is 400-900 DEG C, and the time of the heat treatment is 10 minutes or more; and a pretreatment processcomprises the following steps: dipping the activated carbon in an aqueous solution containing a nickel salt, and then drying. According to the preparation method, the carbon nanotubes grow on the activated carbon in situ, so that the carbon nanotubes can uniformly grow in activated carbon pores and on the inner and outer surfaces, the composite material with a specific pore structure and specificsurface area is obtained, and the requirement of low-temperature denitration is better met.

Description

technical field [0001] The invention relates to the technical field of carbon-based low-temperature denitrification catalysts, in particular to an activated carbon / carbon nanotube composite material, a preparation method thereof, a catalyst and an application thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants in my country, and it is also an important precursor for the formation of pollution such as acid rain, photochemical smog and smog. In recent years, the reduction of air pollutants has achieved initial results, SO 2 Emissions gradually decreased, but NO x Concentrations remain high. Control NO x Emissions are still a daunting task and a key indicator of air pollution reduction. NH 3 Selective catalytic reduction (SCR) method is currently the most effective denitrification method (4NO+4NH 3 +O 2 →4N 2 +6H 2 O). The commercially used V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 A series of denitrification catalysts are mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J23/34B01J32/00B01J35/10B01J37/02B01J37/08B82Y30/00B82Y40/00B01D53/86B01D53/56
CPCB01J21/18B01J21/185B01J23/34B01J37/0201B01J37/088B82Y30/00B82Y40/00B01D53/8628B01D2258/0283B01J35/617Y02C20/20
Inventor 姚露蒋文举王鹏辰
Owner SICHUAN UNIV
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