A Study On The Hydrogen Storage Properties Of Slurry System Composed Of Hydrogen-Storage Alloys And Organic Compound

For its important value in economics and ecology, hydrogen is thought to be the most promising substitute of fossil fuel, especially in the field of fuel cells. The realization of compact, lightweight, cost-effective and safe means of storing and transporting hydrogen is always the target of researchers. The technology of storing hydrogen in a slurry system showed that the hydrogen storage alloy could catalyze the organic compounds at the same time it was hydrogenated, thus spur the hydrogenation/dehydrogenation reaction to occur under moderate conditions. The hydrogen storage capacity of the slurry system is greater than storing hydrogen solely by alloys. The technology is thought to be a very promising hydrogen storage method. In this paper, we studied the hydrogen storage properties of slurry formed by organic liquid and hydrogen storage alloys.Firstly, this paper systematically investigated the kinetics of liquid-phase hydrogenation of toluene in MINi5-C7H8 slurry system. The kinetics model of liquid-phase hydrogenation of toluene was established by investigating the influences of the reaction temperature, pressure and stirring speed on the mass transfer-reaction processes inside the slurry. The result showed that the apparent reaction rate of liquid-phase hydrogenation of toluene in MlNi5-C7H8 slurry system is a typical zero order reaction. The hydrogenation rate has nothing to do with the concentration of toluene or methylcyclohexane, and the liquid phase hydrogenation reaction is first order as to hydrogen concentration. The saturated hydrogen weight absorption capacity of the MlNi5-C7H8 slurry reaches 3.49wt%. In 400K-480K, the activation energy of MlNi5-C7H8 slurry system was 41.01KJ/mol, and the kinetic model can be expressed by:Secondly, after investigated the different hydrogenation storage alloys, we studied the hydrogenation/dehydrogenation capability of magnesium-based alloy LaMg11Ni. On the basis of topography and morphology of LaMgllNi studied by X-ray diffraction (XRD) and SEM, we discussed the effect of mechanical ball milling on the hydrogenation/dehydrogenation kinetics and capability of materials.Lastly, this paper explored the dehydrogenation reaction of cyclohexane catalyzed by hydrogen storage alloy MINi5, which is an important chain for hydrogen storage by slurry system. Through experiment, we found the factors affecting the reaction. The conversion rate increased after installing palladium tubes inside the reactor, which have the property of only allowing hydrogen to penetrate.