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Chemical-looping circulation method for coupling of hydrogen production through methane cracking with CO2 reduction

A chemical chain and methane technology, applied in chemical instruments and methods, inorganic chemistry, carbon monoxide, etc., to achieve the effects of solving carbon deposition problems, efficient conversion, and restoring phases and activities

Active Publication Date: 2020-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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  • Chemical-looping circulation method for coupling of hydrogen production through methane cracking with CO2 reduction
  • Chemical-looping circulation method for coupling of hydrogen production through methane cracking with CO2 reduction
  • Chemical-looping circulation method for coupling of hydrogen production through methane cracking with CO2 reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 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;

[0078] 2) Add deionized water to configure a solution, satisfying that the concentration of nickel nitrate solution in the mixed solution is 0.10mol / L;

[0079] 3) Stir the prepared solution at 40°C for 30 minutes;

[0080] 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;

[0081] 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 0.3mm, and finally NiFe is obtained 2 o 4 -Ca 2 Fe 1.52 Al 0.48 o 5 (mark...

Embodiment 2

[0142] Compared with Example 1, the only difference is that the reaction temperatures in step (1) are respectively 600°C, 650°C, 700°C, 750°C, 800°C or 850°C.

[0143] For methane conversion rate, hydrogen production rate and product content data at different temperatures, see Figure 10-12 .

[0144] After determining the best catalytic oxygen carrier, we optimized the reaction temperature range, taking the hydrogen production rate, hydrogen concentration and methane conversion rate as indicators, the results are as follows Figure 10-Figure 12 shown. It is found that the temperature range of 750-800°C is the optimal temperature range for catalytic methane cracking, and the hydrogen concentration can be as high as about 95%. The high methane conversion rate and high hydrogen concentration solve the separation problem of hydrogen and methane.

Embodiment 3

[0146] Compared with Example 1, the only difference is that the reaction temperatures in step (2) are respectively 750°C, 800°C, 850°C or 900°C.

[0147] Explore the carbon dioxide reduction stage through Example 3, the relationship between CO production rate and CO concentration at different temperatures, the results are as follows Figure 13 to Figure 18 As shown, it can be found that by using CFAN as a catalytic oxygen carrier, we can achieve relatively low temperature and high CO 2 The conversion rate and high CO selectivity have outstanding advantages compared with the existing technology.

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Abstract

The invention belongs to the field of combustion chemical industry and materials, and specifically discloses a catalytic oxygen carrier which is Ni<x>Fe<3-x>O<4>-Ca<2>Fe<y>Al<2-y>O<5>. The invention further discloses a method for applying the novel catalytic oxygen carrier to catalysis of both efficient cracking of methane to produce hydrogen and CO2 reduction. The novel catalytic oxygen carrier provided by the invention can be used for respectively regulating and controlling a reaction of methane catalytic cracking for hydrogen production and a CO2 reduction reaction based on chemical-loopingcirculation. The method comprises the following specific steps: (1) a methane cracking stage: catalyzing methane cracking under the condition of composite catalysis to realize high methane conversionrate and high hydrogen selectivity and to obtain a by-product, i.e., nanocarbon; and (2) a CO2 reduction stage: in the presence of the catalyst and the nanocarbon, realizing high carbon dioxide conversion rate and high carbon monoxide selectivity and realizing the regeneration of the catalytic oxygen carrier at the same time. The method realizes continuous and efficient production of high-purityH2 and emission reduction of CO2 gas.

Description

technical field [0001] The invention relates to the technical fields of functional materials, energy conversion and environmental protection, in particular to a chemical chain methane cracking hydrogen production and CO 2 restore method. 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, p...

Claims

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Application Information

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IPC IPC(8): C01B3/26C01B32/40
CPCC01B3/26C01B2203/0277C01B2203/0475C01B2203/06C01B2203/1058C01B2203/1241C01B32/40
Inventor 孙朝孙志强
Owner CENT SOUTH UNIV
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