One of the prerequisites for the utilization of hydrogen as fuel in car engines or aircraft turbines is a device for the safe and easily handled storage and transportation of hydrogen. Several methods have been proposed for this purpose. Among them are highpressure tanks for gaseous hydrogen, cryogenic vessels for liquid hydrogen and metal hydride storage systems [13]. However, the first two options bear the danger of explosion if improperly handled, and the latter method suffers from high cost and weight. As an alternative, one could envisage hydrogen storage by encapsulation in microporous media. Although reversible occlusion of gases in zeolites is a well known phenomenon e. g., [4,5] little attention has previously been paid to their use as media for hydrogen storage e. g., [69]. The working principle is that the guest molecules are forced, under elevated temperatures and pressures, into the cavities of the molecular sieve host. Upon cooling to room temperature or below, hydrogen is trapped inside the cavities. It can be released again by raising the temperature.

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