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Zeolite membranes offer attractive properties such as molecular sieving, catalytic activity and thermal/chemical resistance for combined reaction and separation. For separations based on shape selectivity, mostly Si-rich zeolites such as Silicalite-1 and DDR have been used since Al-rich zeolite membranes are rarely defect free due to the presence of Al, which creates strong negative surface charges which in turn hinder the intergrowth of zeolite crystals. Zeolite of the type BEA is a large pore zeolite with a three dimensional channel system defined by 12-membered rings and is quite relevant to the petrochemical industry. The literature available about zeolite membranes of the type BEA is limited. So far only 3 research groups claim to have prepared BEA membranes [1,2,3]. In this work defect free BEA type zeolite membranes with varying Si/Al ratio (18 to 36) were prepared on the stainlesssteel supports. The quality of the membranes was analyzed using He/n-hexane permporosimetry, p-/o-xylene isomer separation, and 1,2,4-/1,3,5-trimethyl benzene isomer separation. The results of vapour separation experiments on membrane of the type BEA will be discussed in comparison the MFI-based membranes.

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