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A method for hydrogen production by catalytic methane cracking from modified red mud

A technology for red mud to catalyze methane and red mud, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost and complicated production process of methane cracking catalysts and other issues, to achieve high value-added comprehensive utilization, simplify the preparation process, and prolong the life of the catalyst

Inactive Publication Date: 2016-06-29
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it realizes the resource utilization of red mud and improves the catalytic activity of red mud; on the other hand, it solves the problems of high cost and complicated production process of methane cracking catalyst

Method used

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  • A method for hydrogen production by catalytic methane cracking from modified red mud
  • A method for hydrogen production by catalytic methane cracking from modified red mud
  • A method for hydrogen production by catalytic methane cracking from modified red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The red mud used in this example is the Bayer process red mud.

[0033] The first step: modification of red mud:

[0034] Dry the red mud at 105°C for 2 hours and then crush it through a 200-mesh sieve. Take 20g of dried and sieved red mud in a 1000ml large container, add 600ml of 2mol / L nitric acid solution to it, and put the container into an ultrasonic cleaner. Take it out after ultrasonication for 5 minutes, put it into a 60°C constant temperature water bath for 4 hours, and stir it with a mechanical stirrer at a constant speed of 90r / min during this period; then vacuum filter the suspension to obtain an orange-yellow transparent solution, and then drip the solution Add ammonia water with a mass fraction of 20% to neutralize the precipitation, stir vigorously with a glass rod, and check the pH value of the solution at the same time. Stop adding ammonia water when the pH is close to about 8; leave the precipitate to stand for aging for 1 hour and then vacuum filter i...

Embodiment 2

[0044] The red mud used in this example is the Bayer process red mud.

[0045] The first step: modification of red mud:

[0046] Dry the red mud at 110°C for 2 hours and then crush it through a 200-mesh sieve. Take 20g of dried and sieved red mud in a 1000ml large container, add 500ml of 2mol / L nitric acid solution to it, and put the container into an ultrasonic cleaner. Take it out after ultrasonication for 5 minutes, put it in a 65°C constant temperature water bath for 4 hours, and stir it with a mechanical stirrer at a constant speed of 90r / min during this period; then vacuum filter the suspension to obtain an orange-yellow transparent solution. Add ammonia water with a mass fraction of 30% to neutralize the precipitation and stir vigorously with a glass rod while checking the pH value of the solution. Stop adding ammonia water when the pH is close to about 8; leave the precipitate to age for 1.5 hours and then vacuum filter it. Wash the precipitate with deionized water un...

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Abstract

The invention relates to a method of catalytic cracking of methane over modified red mud for hydrogen production. The method is characterized by comprising the following steps: soaking the red mud in an inorganic acid solution; filtering to obtain transparent filtrate; performing neutralization and sedimentation of the filtrate by using alkali; filtering, washing and drying the sediment before calcining and reducing; and grinding into powder to obtain a catalyst for catalytic cracking of methane. By adopting the method, the resource utilization of the red mud is realized, and the catalyst cost is reduced; and moreover, the catalytic activity of metals and oxides thereof in the red mud are fully used, and a good effect is realized by applying the red mud to the catalytic cracking of methane for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by catalytic methane cracking, and in particular relates to a method for hydrogen production by catalytic methane cracking of modified red mud. Background technique [0002] Red mud is the waste residue of the aluminum smelting industry, because it contains a large amount of iron oxide (α-Fe 2 o 3 ) and appear red, and red mud also contains a large amount of other minerals such as goethite (α-FeOOH), boehmite (γ-AlOOH), rutile (TiO 2 ), quartz (SiO 2 ) and other minerals. At present, most of the red mud is still stored in the way of damming, which not only causes land waste and dust pollution, but also because the red mud itself is strongly alkaline, it is easy to cause land alkalization, pollute groundwater, and even cause long-term storage. The dam failure caused a safety hazard. Therefore, comprehensive development and utilization of red mud resources, recovery of useful substa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C01B3/26
Inventor 刘全润方小可贾建波李风海李国亮李鹏
Owner HENAN POLYTECHNIC UNIV
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