High-performance Ammonia-Selective MFI Nanosheet Membranes.

Nanosheet-based MFI membranes, known to be highly selective for hydrocarbon isomer separations, exhibit an NH3/N-2 mixture separation factor of 2236 with NH3 permeance of 1.1 x 10(-6) mol m(-2) s(-1) Pa-1, and NH3/H-2 separation factor of 307 with NH3 permeance of 2.3 x 10(-6) mol m(-2) s(-1) Pa-1 at room temperature. Consistent with a competitive sorption-based separation, lower operating temperatures and higher pressures result in increased separation factor. At 323 K, with an equimolar mixed feed of NH3/N-2, the fluxes and separation factors at 3 and 7 bar are 0.13 mol m(-2) s(-1) and 191, and 0.26 mol m(-2) s(-1) and 220, respectively. This performance compares favorably with that of other membranes and suggests that MFI membranes can be used in separation and purification processes involving mixtures of NH3/N-2/H-2 encountered in ammonia synthesis and utilization. The membranes also exhibit high performance for the separation of ethane, n-propane and n-butane from H-2.