Membrane-based separations are an attractive means to separate hydrogen from gas mixtures in order to use hydrogen in energy-related applications. Zeolite membranes are robust materials that are well suited to be used in harsh conditions, but they are not typically selective for hydrogen. Several studies have shown that highly selective separations of hydrogen are possible using zeolite membran...

MFI-type zeolites [1] are compounds defined by the chemical formula NaxAlxSi96xO192. Sodium cations are free while Aluminium is substituting Silicium of the structure. When the ratio Si/Al>1000, the zeolite is named silicalite, while below, one calls it NaZSM5 zeolite. These MFI-type zeolites can be represented by a network of interconnected channels. The distance between two intersections is r...

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1. Introduction Combination of pulsed field gradient (PFG) NMR with magic-angle spinning (MAS) NMR is demonstrated to have remarkable advantages in comparison with conventional PFG NMR, if applied to diffusion measurements in beds of nanoporous particles, notably zeolites. These advantages are based on the effect of line narrowing and concern (i) a prolongation of the intervals during which the...