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A kind of cfan catalyst and its preparation and application in hydrogen production from methane

A catalyst, methane technology, applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve easy recovery and utilization, inhibit sintering and agglomeration, and improve methane The effect of conversion rate

Active Publication Date: 2020-07-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the methane cracking hydrogen production technology is still in the stage of laboratory research and development. Compared with the above-mentioned methane conversion technology, it is still in its infancy, and there are many technical problems to be solved urgently, such as the conversion rate of methane in the methane cracking process needs to be further improved, the hydrogen in the product and the Separation of methane, stability of catalysts used for methane cracking, carbon deposition of by-products and separation of catalysts, etc.

Method used

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  • A kind of cfan catalyst and its preparation and application in hydrogen production from methane
  • A kind of cfan catalyst and its preparation and application in hydrogen production from methane
  • A kind of cfan catalyst and its preparation and application in hydrogen production from methane

Examples

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Effect test

Embodiment 1

[0064] 1) Mix ferric nitrate, calcium nitrate, nickel nitrate, aluminum nitrate and citric acid (the molar ratio of Ca-Fe-Al-Ni elements in the material is 4:4:1:1), the molar addition of citric acid is all 1.3 times the total moles of metal atoms;

[0065] 2) Add deionized water and configure it into a solution to meet the concentration of the nickel nitrate solution in the mixed solution of 0.10mol / L;

[0066] 3) Stir the prepared solution at 40°C for 30 minutes;

[0067] 4) Put the solution obtained in step 3) in a drying box, foam and dry for 5 hours in the temperature range of 180°C, and crush and grind the obtained solid sample;

[0068] 5) Put the sample after grinding in the step 4) into a muffle furnace, and calcinate at 850°C for 4 hours in an air atmosphere. The temperature rise rate is guaranteed to be 2.5°C / min. The calcined solid powder is ground to The particle size is less than 0.3mm, and the CFAN catalyst is finally obtained, and the catalyst is ground to a particle ...

Embodiment 2

[0121] Compared with Example 1, the only difference is that the catalytic reaction temperature of methane is 600-850°C. Determine the rate of methane hydrogen production, product hydrogen purity and methane conversion rate, the results are shown in Figure 8 ~ Figure 10 .

[0122] After determining the best catalyst, we optimized the reaction temperature range, using hydrogen yield, hydrogen concentration and methane conversion as indicators, and the results are as follows Figure 8 , Picture 10 Shown. The results of hydrogen production rate and hydrogen concentration in the temperature range of 600-850 ℃, it can be found that when the temperature is lower than 700 ℃, both the hydrogen production rate and the hydrogen concentration, the performance is greatly reduced. When the temperature is higher than 800℃, it can be found that the catalyst performance is good at the initial stage of the reaction, and too high temperature will cause rapid agglomeration and sintering of the ca...

Embodiment 3

[0124] Compared with Example 1, newly prepared CFAN→half an hour catalytic methane cracking CFAN→one hour catalytic methane cracking CFAN, the carrier is slightly reduced, and the coefficient y is from 1.52→1.40→1.28, which proves the minimal reduction of the carrier. The coefficient y gradually decreases from large, and the methane cracking activity of this process does not change significantly, such as Picture 11 , Picture 12 As shown, the oxygen carrier still maintains high catalytic activity for methane cracking, that is, high hydrogen yield and concentration.

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Abstract

The invention belongs to the fields of combustion chemical industry and materials, and particularly discloses a novel catalyst material NixFe3-xO4-Ca2FeyAl2-yO5 for catalyzing efficiently cracking methane to prepare high-purity hydrogen. NixFe3-xO4 nanoparticles are loaded through a Ca2FeyAl2-yO5 carrier, high dispersion of the NixFe3-xO4 nanoparticles is realized, the special design of the carrier realizes uniform and continuous reduction in the methane cracking process, the carrier is split, and the grain size of active groups in the catalytic process is kept, so that the sintering and agglomeration of the catalyst in the methane catalytic cracking process are effectively inhibited. The catalyst still has methane cracking catalytic activity and stability after long-time catalytic methanecracking, and can realize high methane conversion rate and continuous and efficient production of high-concentration hydrogen, and nanocarbon with a low graphitization degree can be obtained.

Description

Technical field [0001] The invention relates to the technical fields of functional materials, energy conversion and environmental protection, and in particular to a catalyst for catalyzing methane cracking to produce hydrogen. Background technique [0002] In the near future, hydrogen energy will become the main way for mankind to use energy, and mankind will establish an energy utilization economic model based on hydrogen energy. The advantages of hydrogen as a fuel are very obvious. First, hydrogen is the cleanest and renewable fuel. The product of chemical combustion is water, and only when the flame temperature is high will some nitrogen oxides be formed. Only water is produced during electrochemical combustion, and no pollutants produced during the combustion of fossil fuels are produced. In addition to being used as fuel, hydrogen is also an important chemical raw material in modern industrial production, especially in fertilizer, petrochemical, coal chemical, food proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J35/02C01B3/26C01B32/162C01B32/15C01B32/205C01B32/05B82Y40/00
CPCB01J23/002B01J23/78B01J35/023B01J2523/00B82Y40/00C01B3/26C01B32/05C01B32/15C01B32/162C01B32/205C01B2203/0277C01B2203/06C01B2203/1058C01B2203/1082C01B2203/1241B01J2523/23B01J2523/31B01J2523/842B01J2523/847
Inventor 孙朝孙志强
Owner CENT SOUTH UNIV