The SAPO-34 separation layers were grown on both single-channel and monolith supports using seeded synthesis where the SAPO-34 seeds were deposited on the supports either by dip-coating, rub-coating, or a newly developed seeding technique. The membranes prepared on monolith supports had average CO2 permeances of 6.3 x 10-7 +/- 0.9 mol/(m2sPa) and average selectivities of 56 +/- 4 for 50/50 CO2/CH4 mixtures at 46 bar feed pressure. These permeances and selectivities were probably limited by concentration polarization because the available mass flow controllers limited the maximum feed rate and resulted in high stage cuts when the seven-channel monoliths were used. Analysis of the monolith membranes by SEM indicate that the SAPO-34 layers were a few µm thick, and they were slightly thinner than SAPO-34 membranes prepared on single channel tubes.
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