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Carbon nano-crystal hydrogen-storage material and preparation method

A technology of hydrogen storage materials and carbon nanocrystals, which is applied in chemical instruments and methods, fuel cells, and final product manufacturing, can solve the problems of high hydrogen depletion temperature, low ball milling efficiency, and high raw material cost, and achieve low hydrogen depletion temperature, The effect of short milling time and low price

Inactive Publication Date: 2007-02-14
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1999, S.Orimo et al. ball milled natural graphite for 80 hours to obtain a hydrogen storage material with a hydrogen storage density of 7.4wt%. High raw material cost, low ball milling efficiency, high hydrogen release temperature

Method used

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  • Carbon nano-crystal hydrogen-storage material and preparation method
  • Carbon nano-crystal hydrogen-storage material and preparation method
  • Carbon nano-crystal hydrogen-storage material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A Vietnamese Hongji anthracite sample (dry basis ash content 6.02%) was coarsely crushed with a jaw crusher and vibrating mill until the particle size was 99%) to 2MPa, and put it into an ND7-2 type frequency conversion planetary ball mill for ball milling for 1 hour to obtain a hydrogen storage material. Its transmission electron microscope pictures are as figure 1 As shown, it shows that its particle size is 20-100nm; its electron diffraction photo is as figure 2 As shown, it shows that it is a nanocrystalline structure; its differential scanning calorimetry curve is as follows image 3 As shown, it shows that the starting temperature of hydrogen desorption is 235°C, and the main peak temperature of hydrogen desorption is 299°C. The amount of hydrogen released (mass percentage of released hydrogen to material) at 300°C for 20 minutes was 5.45wt% by water drainage method.

Embodiment 2

[0018] The difference from Example 1 is that the mass ratio of coal soda for deashing coal is 1:6, the concentration of hydrochloric acid is 10%, the acid leaching time is 8 hours, and the coal ash content is reduced to 0.05%. The X-ray diffraction curve is as follows: Figure 4 As shown, it shows that no obvious mineral exists, and the hydrogen desorption amount of the obtained hydrogen storage material is 5.48wt%.

Embodiment 3

[0020] The difference from Example 1 is that the mass ratio of soda coal for coal deashing is 1:2, the concentration of hydrochloric acid is 2%, the acid leaching time is 2 hours, the ash content of the coal is reduced to 1.36%, and the hydrogen release capacity of the obtained hydrogen storage material is 5.30%. wt%.

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Abstract

The invention discloses a carbon nanometer crystal hydrogen storage material and the making method. The constituents of the material includes 60-90wt% coal based carbon with hexagonal net grid layer crystal structure and the particle diameter is 20-100nm, 10-40wt% of one or several metal from Na, Al, Ti, V, Cr, Fe, Ni, Zn, Mo, and Pd. The method includes the following steps: taking alkali washing and acid washing to coal, after 1000-1600 degree centigrade carbonization, adding the metal powder, under 0.5-3MPa hydrogen pressure, taking ball milling for 0.5-8h. It has the advantages of large hydrogen storage density, low raw material cost, simple technology, etc.

Description

technical field [0001] The invention relates to an energy storage material and a preparation method, in particular to a carbon nanocrystal hydrogen storage material and a preparation method. Background technique [0002] Fuel pollution and oil shortage are increasingly affecting the development of my country's automobile industry. The reaction of hydrogen in the fuel cell only generates water without any pollutant discharge, which can be called green energy; and its source is abundant, which can be obtained by electrolysis of water by solar energy, nuclear energy or hydropower, or from natural gas reforming, coal gasification, coal Obtained in coking, oil cracking and other processes. Driving vehicles with hydrogen fuel cells can achieve zero emission of vehicle pollutants to protect the environment and diversify energy sources to reduce dependence on oil. At present, the bottleneck restricting the development of hydrogen fuel cell vehicles is hydrogen storage and transpor...

Claims

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Application Information

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IPC IPC(8): C22C29/00H01M8/00B01J20/20
CPCY02E60/50Y02P70/50
Inventor 周仕学胡秀颖杨敏建姜瑶瑶雷桂芹
Owner SHANDONG UNIV OF SCI & TECH
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