In the framework of the EC project STORHY (Hydrogen Storage for Automotive Applications), the prototype of a solid storage tank for hydrogen based on sodium alanate was developed. A storage tank containing 8 kg sodium alanate was designed and manufactured with the objective of fast refueling. To obtain the optimum design of the storage tank a simulation tool was developed and validated by experiments with a laboratory-scale tubular reactor. Application of the simulation tool to different storage concepts and geometries yielded the final design. The chosen concept is modular, enabling simple scale-up. This is the basis for the future development of fuel cell vehicle storage tanks containing 5 kg of hydrogen.
Ag2+ centres are produced in doped and appropriately treated AgCl crystals by irradiation with blue light a t 20 OK. It is shown that the only purpose of the preceding treatment is to create a high concentration of electron traps. I n chalcogen doped crystals (AgCl :S, Se, Te) electron traps are formed by pre-irradiation with blue light above 120 " K ; in iron doped crystds the incorporated Fe2+ ions are converted to Fe3+, acting as traps, either by irradiation a t 20 "C or by annealing in chlorine gas. As the paramagnetic data of the localized Ag2+ centres are independent of the kind of the impurity, one must conclude that the hole is trapped in the undisturbed lattice.Ag2+-Zentren werden in dotierten und geeignet behandelten AgC1-Kristallen durch Bestrahlung mit blauem Licht bei 20 O K erzeugt. Es wird gezeigt, daB die Aufgabe der Vorbehandlung allein darin besteht, eine hohe Konzentration von Elektronenfallen zu schaffen.I n chalkogen-dotierten Kristallen (AgC1: S, Se, Te) wird die Bildung von Elektronenfallen durch Vorbestrahlung mit blauem Licht oberhalb von 120 OK bewirkt ; in eisen-dotierten Kristallen werden die eingebauten Fez+-Ionen entweder durch Bestrahlung bei 20 "C oder durch Tempern in Chlorgas in Fe3+ umgeladen, das als Fanger dient. Da die paramagnetischen Daten der lokalisierten Agz+-Zentren unabhangig von der Art des Zusatzes sind, muB man auf einen Einfang der Defektelektronen im ungestorten Gitter schlieSen.
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