Hydrolysis Process Of Aluminum Based By Ultrasonic Activation Hydrogen Production Research

Hydrogen as a clean energy carrier, it’s very good to solve the energy shortage and environmental pollution problems. At present, the traditional hydrogen production methods mainly include: electrolysis of water, hydrogen generation from biomass and a variety of hydrocarbons, which generally exist some problems of high expensive and low purity.Hydrogen production from Al hydrolysis is free from these drawbacks and it has been proved to be a feasible solution to the problems of the storage and transportation of hydrogen. As a raw material, Al has numerous advantages, such as ample resources, high energy density, low cost, and easy storage. However, a layer of dense Al2O3 film rapidly forms on the surface of Al as long as it is exposed to the air, and thus hinders the hydrolysis reaction between Al and H2 O. Therefore, studies on how to break or decompose this oxide film to allow the reaction of Al with water are an important endeavor.In this paper, studies are mainly focused on the ultrasonic power and reaction temperature on the metal aluminium hydrolysis and production characteristics, the influence of using XRD and SEM analysis of sludge composition and microstructure, nitrogen adsorption than surface analysis at different stages of aluminum particle pore size and specific surface area. The results showed that the ultrasonic power and water bath temperature is inversely proportional to the reaction induction time of aluminum with water, is proportional to the rate of hydrogen production. With the increase of bath temperature, the high rate of hydrogen is 4.8m L/min?g、6.8mL/min?g、8.3mL/min?g and 10mL/min?g. In the ultrasonic field, Al-based powder is easily broken into multiporous particles with larger specific surface area, and has a shorter induction period of aluminum-water reaction and faster rate of hydrogen production compared with pure Al powder. Moreover, the hydrogen conversion rate and the maximum hydrogen generation rate would rise with the increasing of ultrasonic intensity.The effect of Ca O, NaOH, NaCl ratio on molding materials for hydrogen production is studied. The results show that the duration of stabile hydrogen production for 100 min can be achieved when the mass ratio of CaO/NaOH reachs 2:3. The hydrogen production rate of Al-based powder adding CaO, NaCl is proportional to the mass ratio of CaO/NaCl, and the duration of stabile hydrogen production for 600 min. Hydrogen production rate curve is relatively flat, and Ca O/NaCl quality can decide hydrogen conversion and reaction rate.