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A method for producing hydrogen by hydrolysis of borohydride using water vapor

A hydrogen production technology of borohydride and hydrolysis, which is applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the difficulty of speed and start-stop control of the reaction process, affect the reaction efficiency and hydrogen production, and the permeability of crystal water Limited and other problems, to achieve the effect of easy control, improved utilization rate, and improved penetration ability

Active Publication Date: 2021-10-26
浙江高成绿能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen production method described in this patent has the following disadvantages: ① Some hydrated compounds have a relatively low dehydration temperature, and will lose crystal water when heated to 40°C. Such solids need to be stored in a low-temperature environment after mixing, otherwise hydrogen may be generated at any time Dangerous. At the same time, some compounds have a high dehydration temperature and need to be heated to several hundred degrees to start dehydration. This kind of solid mixture is convenient and safe to store and transport, but the energy consumption of the reaction process increases
②Because all raw materials are mixed together, it is difficult to control the rate and start-stop of the reaction process, and there is often hysteresis
③In order to fully react the solid mixture, it must be mixed uniformly and heated as much as possible to reduce the temperature difference between the inside and outside of the mixture, otherwise local agglomeration is prone to occur, and the crystal water penetration is limited, which seriously affects the reaction efficiency and Hydrogen production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2g of sodium borohydride and 1g of boric acid, add them into a mortar, grind and mix them evenly, disperse and add 0.8g of foam particles; take 4g of water and place them at the bottom of the test tube, design a bracket structure to place the material layer on the top of the water surface. The test tube was heated to 100°C and the hydrogen gas produced was collected by the drainage method. 4.2L of hydrogen gas was produced within 60 minutes, which was 88.6% of the theoretical hydrogen production.

Embodiment 2

[0027] Weigh 2g of sodium borohydride and 2g of anhydrous magnesium sulfate, add them into a mortar, grind and mix evenly, disperse and add 1g of activated carbon powder; take 6g of sodium carbonate decahydrate and place it at the bottom of the test tube, design a bracket structure to place the material layer on the top of the water surface. The test tube was heated to 95°C and the hydrogen gas produced was collected by the drainage method. 4L of hydrogen gas was produced within 60 minutes, which was 84.4% of the theoretical hydrogen production.

Embodiment 3

[0029] Weigh 1g of sodium borohydride, 1g of potassium borohydride, and 2g of boric acid, add them into a mortar, grind and mix evenly, disperse and add 1g of activated carbon powder; take 4g of water and place it at the bottom of the test tube, and design a bracket structure to place the material layer on the top of the water. The test tube was heated to 100°C and the hydrogen gas produced was collected by the drainage method. 3.7L of hydrogen gas was produced within 60 minutes, which was 91.8% of the theoretical hydrogen production.

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PUM

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Abstract

The invention discloses a method for producing hydrogen by hydrolyzing borohydride with water vapor. The borohydride, catalyst and leavening agent powder are evenly mixed, and then water or water-containing substances are heated, and the generated water vapor is passed into the solid mixture for hydrolysis. Hydrogen production. The method uses steam to supply water, which greatly increases the hydrogen storage density, increases the reaction contact area, and improves the utilization rate of borohydride; and the reaction rate can be controlled by adjusting the temperature and supply of steam. By adding a leavening agent to the hydrogen-producing material, the permeability of water vapor is improved, and the water vapor and the solid mixture are quickly and fully contacted, and the agglomeration phenomenon caused by the crystallization of the by-product metaborate is avoided, and the borohydride concentration is effectively increased. reaction efficiency. The water or water-containing substance is placed separately from the solid mixture, which is convenient for storage and transportation, and convenient for the control of the hydrogen production rate.

Description

technical field [0001] The invention relates to a hydrogen production technology, in particular to a method for producing hydrogen by hydrolysis of borohydrides using steam. Background technique [0002] With the rapid economic development, fossil energy is consumed in large quantities, resulting in a shortage of non-renewable energy and serious environmental pollution. Hydrogen energy can be described as an ideal energy source in the future. It can provide fuel for fuel cells. Hydrogen has high energy density and non-polluting products, which can effectively solve the problems caused by current fossil fuels. There are many ways to prepare hydrogen, such as catalytic reforming hydrogen production, biological hydrogen production, photocatalytic hydrolysis hydrogen production, electrolysis water hydrogen production, borohydride hydrolysis hydrogen production and so on. Among them, hydrogen production by hydrolysis of borohydride is the most widely studied one at present, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/06
CPCC01B3/065Y02E60/36
Inventor 刘艺培侯向理叶龙
Owner 浙江高成绿能科技有限公司