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Method for preparing hydrogen by using improved silica-alkali method

A hydrogen and alkali technology, applied in the production of hydrogen, silicates, alkali metal silicates, etc., can solve the problems of inability to meet large-scale commercial needs, high alkali concentration, and fast reaction rate, and achieve good results. Environmental suitability and practicality, reduction in dosage, effect of preventing particle agglomeration and oxidation

Inactive Publication Date: 2017-11-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there have been related researches on hydrogen production from silicon-alkali water, mainly using methods such as nanometerization and porosity to improve the hydrogen production performance of silicon. For example, porous silicon with a particle size and porous wall thickness of several nanometers is combined with Mg. The method has a fast reaction rate, is difficult to control, and requires a high concentration of lye. At the same time, the production of hydrogen through nano-sized silicon and porous silicon is not only costly, but also complicated, and cannot meet large-scale commercial needs.

Method used

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Examples

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Effect test

Embodiment 1

[0035] Mix ferrosilicon-alkali composite powder and potassium hydroxide at a mass ratio of 1:10, add 25 mass multiples of pure water, and react at 30°C to produce hydrogen gas, which can be converted to the above-mentioned yield per gram of ferrosilicon The amount of hydrogen is 450ml. The ferrosilicon-alkali composite powder is a ferrosilicon alloy with a silicon content of 45wt%.

Embodiment 2

[0037] The method for preparing hydrogen by the improved silicon-alkali method of this embodiment includes:

[0038]Ferrosilicon alloy with a silicon content of 97wt% was crushed until the material particle size was -200 mesh, and then ball milled for 2 hours in an argon atmosphere with a ball-to-material ratio of 10:1 to obtain ferrosilicon-alkali composite powder.

[0039] Mix ferrosilicon alloy and potassium hydroxide according to the mass ratio of 1:0.5, then add 5 mass times of sodium silicate solution to react at 25°C to produce hydrogen, and convert the above-mentioned hydrogen production per gram of ferrosilicon The volume is 926ml.

Embodiment 3

[0041] The method for preparing hydrogen by the improved silicon-alkali method of this embodiment includes:

[0042] The ferrosilicon alloy with a silicon content of 80wt% was crushed until the material particle size was -300 mesh, and then ball milled for 0.5h in an argon atmosphere with a ball-to-material ratio of 30:1 to obtain ferrosilicon-alkali composite powder.

[0043] Ferrosilicon alloy and potassium hydroxide are mixed according to the mass ratio of 1.2:15, and then added to an aqueous reaction medium with a mass multiple of 28 to react at 45°C to produce hydrogen, which is converted to the above-mentioned hydrogen production per gram of ferrosilicon It is 1031ml.

[0044] In this embodiment, the aqueous reaction medium is a mixed aqueous solution of sodium carbonate and potassium carbonate in any ratio.

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Abstract

The invention discloses a method for preparing hydrogen by using an improved silica-alkali method, and belongs to the technical field of on-line hydrogen preparation. The preparation method comprises the steps that silicon iron alkali composite powder and potassium hydroxide are mixed in the mass ratio of (1-1.2):(0.5-15), and then added into an aqueous reaction medium with the mass being (1-30) times of the mass of the mixture, a reaction is conducted at the temperature of 25-70 DEG C, and the hydrogen is prepared, wherein the silicon iron alkali composite powder comprises silicon-iron alloy. According to the method, the process is simple and easy to control, the hydrogen yield can be improved, and the hydrogen preparation cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of on-line hydrogen preparation, in particular to a method for preparing hydrogen by an improved silicon-alkali method. Background technique [0002] As a clean and efficient multi-purpose energy medium, hydrogen energy has outstanding advantages in the social and economic application scenarios of the energy market. In addition, the development and utilization of hydrogen energy is of great significance to solving the dual crises of energy depletion and environmental degradation faced by human society. However, some problems restricting the large-scale commercialization of hydrogen energy have not been effectively resolved, such as how to obtain safe, efficient and cheap hydrogen sources. [0003] At present, there have been related researches on hydrogen production from silicon-alkali water, mainly using methods such as nanometerization and porosity to improve the hydrogen production performance of silicon...

Claims

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Application Information

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IPC IPC(8): C01B3/06C01B33/32
CPCC01B3/06C01B33/32Y02E60/36
Inventor 陈云贵吴朝玲廖健
Owner SICHUAN UNIV
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