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Method for preparing multi-walled carbon nanotubes by deoxidizing coalbed methane

A technology of multi-walled carbon nanotubes and coalbed methane, applied in the direction of multi-walled carbon nanotubes, chemical instruments and methods, carbon compounds, etc., can solve the problems of methane cracking reaction, high deoxidation reaction temperature, methane cracking consumption, etc., to achieve The effect of reducing energy consumption, improving utilization efficiency, and reducing transportation costs

Pending Publication Date: 2020-03-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The disadvantage of this method is that the deoxygenation reaction temperature is too high, and methane cracking reaction will occur
The disadvantage is very obvious, that is to consume precious coke resources, the consumption cost of coke is about 50% of the whole operation cost, and the methane will be cracked and consumed during the deoxidation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.5%Pt / Al 2 o 3 The preparation steps of deoxidation catalyst are as follows: get 0.664g H 2 Pt Cl 6 ·6H 2 O was added to 700ml of distilled water and stirred until the Pt salt was completely dissolved, and 49.75g of Al was added 2 o 3 The carrier was stirred at room temperature for 12 h, and after suction filtration, the obtained solid was washed successively three times with ethanol and deionized water, each time with 100 ml of washing liquid, and then the obtained solid was dried in an oven at 80 ° C for 8 h, and the dried solid was dried at 5 %H 2 / 95%N 2 Roasting in a mixed gas, the roasting temperature is 300°C, and the roasting time is 3h, the oxygen-containing coalbed methane deoxidation catalyst can be prepared, which is recorded as 0.5%Pt / Al 2 o 3 .

[0040] The preparation steps of 40%Ni / MgO multi-walled carbon nanotube catalyst are as follows: 70.81gNi(NO 3 ) 2 ·6H 2 O dissolved in 115ml water to form Ni(NO 3 ) 2 ·6H 2 O transparent solution, ...

Embodiment 2

[0046] 5%Ru / Al 2 o 3 The preparation steps of deoxidation catalyst are as follows: take 5.131g RuCl 3 Add to 700ml of distilled water and stir until the Ru salt is completely dissolved, add 47.5g of roasted Al 2 o 3 The carrier was stirred at room temperature for 12 h, and after suction filtration, the obtained solid was washed successively three times with ethanol and deionized water, each time with 100 ml of washing liquid, and then the obtained solid was dried in an oven at 80 ° C for 8 h, and the dried solid was dried at 5 %H 2 / 95%N 2 Roasting in a mixed gas, the roasting temperature is 300°C, and the roasting time is 3h, the oxygen-containing coalbed methane deoxidation catalyst can be prepared, which is recorded as 5%Ru / Al 2 o 3 Catalytic deoxidation reaction.

[0047] The catalytic deoxygenation reaction steps are as follows:

[0048] (1) CH 4 The content is 45% and O 2 Oxygen-containing coalbed methane with a content of 12% is passed into a 50g deoxidation c...

Embodiment 3

[0052] 1%Pd / TiO 2 The preparation steps of deoxidation catalyst are as follows: take 0.833gPdCl 2 Add to 700ml of distilled water and stir until the Pd salt is completely dissolved, add 49.5g of roasted Al 2 o 3 The carrier was stirred at room temperature for 12 h, and after suction filtration, the obtained solid was washed successively three times with ethanol and deionized water, each time with 100 ml of washing liquid, and then the obtained solid was dried in an oven at 80 ° C for 8 h, and the dried solid was dried at 5 %H 2 / 95%N 2 Roasting in a mixed gas, the roasting temperature is 300°C, and the roasting time is 3h, the oxygen-containing coalbed methane deoxidation catalyst can be prepared, which is recorded as 1% Pd / Al 2 o 3 Catalytic deoxidation reaction.

[0053] The catalytic deoxygenation reaction steps are as follows:

[0054] (1) CH 4 The content is 60% and O 2Oxygen-containing coalbed methane with a content of 7% is passed into a 50g deoxidation catalys...

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Abstract

The invention discloses a method for preparing multi-walled carbon nanotubes by deoxidizing coalbed methane. The method mainly comprises the steps of: introducing oxygen-containing coalbed methane into a fixed bed deoxidation reactor filled with a deoxidation catalyst, and introducing volatile organic compounds to carry out deoxidation reaction until the oxygen content in coalbed methane is lowerthan 0.5%; introducing the catalytically deoxidized coalbed methane into a fluidized bed reactor to prepare a multi-walled carbon nanotube crude product by adopting catalytic chemical vapor deposition(CCVD); and finally, soaking the prepared crude product in dilute nitric acid, performing stirring, refluxing rinsing with water, and performing drying to obtain the multi-walled carbon nanotubes. According to the method provided by the invention, methanol steam reacts with oxygen in the coalbed methane under the action of a catalyst to generate water and carbon dioxide, so that potential safetyhazards caused by O2 in coalbed methane are avoided, and the problems of the low methane concentration, the high methane loss rate and the like in product gas due to methane cracking caused by coalbedmethane deoxidation of an existing fixed bed are solved through low-temperature deoxidation.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas, and in particular relates to a method for preparing multi-walled carbon nanotubes after deoxidizing coal bed gas. Background technique [0002] Multi-walled carbon nanotube (MWCNT) was discovered by Dr. Ijima, a Japanese electron microscope expert, in 1991. It can be regarded as a graphite plane (or curved surface) composed of carbon six-membered rings that is curled in a certain way. nanoscale tubular materials. Multi-walled carbon nanotubes have many excellent properties, such as excellent electrical conductivity, good thermal conductivity, ultra-high strength and tensile strength, large specific surface area, high-efficiency catalytic performance, etc. It has broad application prospects in the fields of physical sensors, catalytic materials and composite materials. [0003] After more than 30 years of development, the carbon sources of multi-walled carbon nanotubes are various, such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162C10L3/10
CPCC01B32/162C10L3/10C01B2202/06
Inventor 陈秉辉唐旭光郑进保谢建榕叶松寿吴钊男
Owner XIAMEN UNIV
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