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CFAN catalyst, preparation method thereof, and application of CFAN catalyst in production of hydrogen from methane

A catalyst, methane technology, used in heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to improve stability and catalytic activity, inhibit sintering and agglomeration, The effect of suppressing sintering and agglomeration

Active Publication Date: 2020-01-24
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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  • CFAN catalyst, preparation method thereof, and application of CFAN catalyst in production of hydrogen from methane
  • CFAN catalyst, preparation method thereof, and application of CFAN catalyst in production of hydrogen from methane
  • CFAN catalyst, preparation method thereof, and application of CFAN catalyst in production of hydrogen from methane

Examples

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Effect test

Embodiment 1

[0065] 1) Mix iron nitrate, calcium nitrate, nickel nitrate, aluminum nitrate and citric acid (in the material, the molar ratio of Ca-Fe-Al-Ni element is 4:4:1:1), and the molar addition amount of citric acid is all 1.3 times the total molar weight of metal atoms;

[0066] 2) Add deionized water to configure a solution, satisfying that the concentration of nickel nitrate solution in the mixed solution is 0.10mol / L;

[0067] 3) Stir the prepared solution at 40°C for 30 minutes;

[0068] 4) Put the solution obtained in step 3) in a drying oven, foam and dry for 5 hours at a temperature range of 180° C., and crush and grind the obtained solid sample;

[0069] 5) Put the ground sample in step 4) into a muffle furnace, and calcinate it at 850° C. for 4 hours in an air atmosphere. The heating rate is guaranteed to be 2.5° C. / min, and the calcined solid powder is ground to The particle size is less than 0.3 mm, and the CFAN catalyst is finally obtained, and the catalyst is ground t...

Embodiment 2

[0123] Compared with Example 1, the only difference is that the methane catalytic reaction temperature is 600-850°C. Determination of methane hydrogen production rate, product hydrogen purity and methane conversion rate, the results are shown in Figure 8 ~ Figure 10 .

[0124] After determining the best catalyst, we optimized the reaction temperature range, using hydrogen production rate, hydrogen concentration and methane conversion as indicators, the results are as follows Figure 8 , Figure 10 shown. From the graph of hydrogen yield and hydrogen concentration results in the temperature range of 600-850°C, it can be found that when the temperature is lower than 700°C, both the hydrogen yield and the hydrogen concentration will drop significantly in performance. When the temperature is higher than 800°C, it can be found that the catalyst has good performance at the initial stage of the reaction, but too high a temperature will cause rapid agglomeration and sintering of t...

Embodiment 3

[0126] Compared with Example 1, the newly prepared CFAN→half-hour catalytic methane cracking CFAN→one-hour catalytic methane cracking CFAN, a slight reduction of the carrier occurs, and the coefficient y is from 1.52→1.40→1.28, which proves the trace reduction of the carrier. The coefficient y gradually decreases from large to small, but the methane cracking activity of the process does not change significantly, such as Figure 11 , Figure 12 As shown, the oxygen carrier still maintains high catalytic activity for methane cracking, that is, high hydrogen production rate 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, 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 human beings to utilize energy, and human beings will establish an energy utilization economic model with hydrogen energy as the mainstay. The advantages of hydrogen as a fuel are obvious. First, hydrogen is the cleanest, renewable fuel available. The product of chemical combustion is water, and some nitrogen oxides are only formed when the flame temperature is very high. Only water is produced during electrochemical combustion, without the pollutants produced during the combustion of fossil fuels. In addition to being used as fuel, hydrogen is also an important chemical raw material in modern industrial production, especially in fertilizers, petrochemicals, c...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J35/02C01B3/26C01B32/162C01B32/15C01B32/205C01B32/05B82Y40/00
CPCB01J23/002B01J23/78C01B3/26C01B32/162C01B32/15C01B32/205C01B32/05B82Y40/00B01J2523/00C01B2203/0277C01B2203/1058C01B2203/1082C01B2203/1241C01B2203/06B01J35/40B01J2523/23B01J2523/31B01J2523/842B01J2523/847
Inventor 孙朝孙志强
Owner CENT SOUTH UNIV
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