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Study on Effect of Hydrogen Storage Properties of Magnesium

Author: MaHuaiYing
Tutor: ZhouShiXue
School: Shandong University of Science and Technology
Course: Mineral Processing Engineering
Keywords: Magnesium Reaction milling Hydrogen Storage Carbon Catalytic
CLC: TG139.7
Type: Master's thesis
Year: 2010
Downloads: 127
Quote: 0
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Abstract


Magnesium has a hydrogen storage density, low prices, resource-rich, and is considered to be the most promising hydrogen storage material. This paper studies the various milling parameters, carbon materials and metal catalyst reaction milling Preparation of Mg-based hydrogen storage materials to add variety and add the amount of magnesium hydrogen storage properties, in order to optimize the preparation parameters, performance hydrogen storage materials. The reaction milling method preparation parameters. Milling when charged with hydrogen pressure and the ball feed ratio have a greater impact on the Preparation of the material dispersion and the hydrogen storage density, this article uses of 1MPa of hydrogen pressure and ball feed ratio of 45:1, the material prepared under this condition has a higher hydrogen storage density and good dispersibility. Affect the process of milling time on the particle size, hydrogen storage density exists - the critical time range, extended milling time within the critical time is conducive materials to reduce the particle size to improve the hydrogen storage density; continue milling after exceeding the critical time range is not only easy to cause particle agglomeration and is not conducive to the improvement of hydrogen storage density · and to discharge the hydrogen temperature decrease. According to the experimental results to determine the 3-4h for best milling time, is too short and the long ball milling are not conducive to the improvement of the material properties. Different number of hydrogen charging and hydrogen charging interval on the preparation of materials performance. Milling pure magnesium, the material almost all welded to the tank wall and balls, hydrogen storage density is very low. Carbon materials can significantly improve the milling magnesium reunion conducive the magnesium particles of refinement. Different carbon materials due to the different structure and nature of the role played by different. This paper compares carbonized anthracite, the deposition of carbon, graphite, needle coke, activated carbon structural characteristics of the five carbon materials and improved hydrogen storage materials prepared magnesium milling effect. Five carbon material dispersion of magnesium from strong to weak as follows: Graphite gt; activated carbon gt; sedimentary charcoal gt; the needle coke gt; anthracite, with different amounts of the same kinds of carbon materials, dispersion properties with the added amount The increases. Add carbonized anthracite can significantly improve the magnesium hydrogen storage density. Anthracite and needle coke mixed and added can significantly improve the dispersibility when the milling and increase the density of magnesium hydrogen storage. The carbon material can reduce the hydrogen desorption temperature of magnesium hydride, with the increase in the amount of carbon material to be added to improve such a discharge degree of reduction of the hydrogen temperature. Add metal catalyst can significantly improve hydrogen storage properties of magnesium-based hydrogen storage materials. The total amount of each metal catalyst addition of more than 1wt%, it is not conducive to the improvement of density of hydrogen storage. Added four metal catalyst Ni, Al, Mo, Co, and not with the magnesium to form a metal alloy or a metal hydride, and only in the material during the preparation from the grinding aid and catalysis. Prepared by adding a variety of metal catalyst of hydrogen storage materials in the hydrogen desorption process studies show that the metal catalyst can reduce the hydrogen storage material of the hydrogen desorption temperature, and the hydrogen desorption temperature of the material decreases with the increase of the added amount of the metal catalyst.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Hydrogen storage alloy
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