We demonstrate that b-oriented MFI zeolite membranes can be manufactured by in-situ crystallization using an intermediate amorphous SiO2 layer. The improved in-plane growth by using a zeolite growth modifier leads to fusion of independent crystals and eliminates boundary gaps, giving good selectivity in the separation of CO2/Xe mixtures. The fast diffusion of CO2 dominates the overall membrane selectivity towards CO2/Xe mixture. Because of the straight and short  channels, the obtained CO2 permeation fluxes are several orders of magnitude higher than those of carbon molecular sieving membranes and polymeric membranes, opening opportunities for Xe recovery from waste anaesthetic gas.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work is financially supported by STW, The Netherlands (Project number 13941). The authors thank Bart van der Linden (Delft University of Technology, TUD), Willy Rook (TUD) and Liliana Baron (TUD) for their help with gas separation performance and gas uptake measurements.