The Study On Aluminum Alloy Used For Hydrogen Generation With Water

As a secondary energy a renewable, hydrogen has been more widely studied and applied, but the high cost of hydrogen storage and low hydrogen content per unit volume, and there are still a variety of security issues, and thus development of safe, reliable, low-cost hydrogen production methods has become an urgent need.Aluminum is an abundant, high specific energy, the nature of active metal, and other hydrogen production methods comparison, the reaction of aluminum with water to produce hydrogen with a more in hydrogen production costs, environmental security, and other aspects of hydrogen production device is simple to highlight the advantages.However, the surface is easy to form a dense aluminum oxide film on an inert, it hardly causes the reaction in water.Aluminum can be eliminated if the inert surface oxide film, the water activity of the reaction will be greatly increased, the aluminum can be a very promising material for hydrogen.This paper aims at adding low melting point metal Ga, In, Zn, Sn, and inorganic salts NaCl, SnCl2to change the surface morphology of aluminum, aluminum to destroy dense surface oxide film, to achieve rapid hydrolysis of aluminum hydrogen.The main contents are as follows:(1) The meterials were prepared by vacuum melting method of Al-NaCl and Ga, In, Sn alloy, and compare the performance of the hydrogen desorption reaction with water at room temperature, the hydrogen desorption properties of alloys made good further analysis to study the additive content effects of hydrogen release properties of the alloy.Experiments show that, besides a small amount of water vapor, NaCl can produce high purity hydrogen, is not the more the better, but the NaCl content when20%amount of hydrogen is the most. In the alloy extent of the impact of the activity of aluminum In<Sn<Ga， when Ga、In、Sn quality score of Al-Ga-In-the ratio of the number of Sn alloy is7:7:7, for Al-Ga-In-Sn will be the best formula ratio of alloy.(2) The meterials were prepared by mechanical milling method of Al-NaCl and Zn, Sn alloy, and analyzes and compares the performance to put hydrogen reacts with water at room temperature for hydrogen desorption good performance alloy Al-NaCl did further research.Studied the NaCl content, milling time to put the impact properties of hydrogen Al-NaCl. And explore the reaction mechanism of the alloy reacts with water. Theresults showed that84wt.%Al-17wt.%NaCl-5wt.%Zn hydrogen best performance, the maximum production rate can be reached125mL/g, in hydrogen production rate can reach86.7%.(3) to explore the Al-NaCl doped alkali metals, transition metal elemental materialsto improve the hydrogen yield, analyzes and compares the performance to put hydrogenreacts with water at room temperature and hydrogen desorption properties of a goodchoice to do further research, the effect of the ball as well as feed additive content thanthe hydrogen desorption properties of the alloy, and to study the reaction mechanism ofthe alloy reacts with water.(4) The effect of NaCl on anhydrous SnCl2and anhydrous hydrogen production performance aluminum alloys, Al-SnCl2showed that the hydrogen desorption systemperformance is relatively good,25℃maximum hydrogen production rate can reach1986mL/ming, literature is higher hydrogen production rate of the material. Also,examine the milling time and the impact on the alloy content of anhydrous SnCl2hydrogen production performance through analysis of the microstructure of the materialbefore and after the reaction (XRD), differential scanning calorimetry (DSC), andchanges in pH during the reaction, etc. analysis, reaction mechanism was discussedAl-SnCl2reacts with water.Al-SnCl2system having a high reaction rate, but a low yield of hydrogen, in orderto further improve the yield was investigated alkali metal, a transition metal elementalMg, Ti, Zn, Bi, Cr effect of hydrogen release properties of alloy Al-SnCl2, The resultsshow that only Bi is added to achieve the purpose of improving yield. So forAl-SnCl2-Bi alloys do further research to examine the impact of the ball feed ratio andBi content on Al-SnCl2-Bi on the hydrogen desorption properties, and the influence ofaluminum content of hydrogen desorption capacity. By XRD analysis, analysis of thereaction process, such as changes in the pH of the reaction mechanism was studiedAl-SnCl2-Bi alloy reacts with water. Experimental results show that the milling processgenerates Sn and Bi was added to the reaction did not occur during the reaction with thealuminum micro corrosion cell is formed to accelerate the reaction. By calculating thetheoretical calculation, it is found after adding Bi, the activity of Al can be improvedwhile suppressing the reaction to some extent on the Al surface can be formed a denseoxide layer. This result explains why the Al-SnCl2-Bi material is substantiallycompletely reacted with water.