“…By comparing the NaA membrane synthesized by microwave heating on macroporous substrate with that by conventional hydrothermal synthesis by Aoki et al [22], the permeance of our NaA membrane was at least 7 times larger, while the H 2 /C 3 H 8 permselectivity was similar. Compared to that of multiple syntheses in gel [14], the permeance of the NaA membrane here was at least 2 times larger; the H 2 /C 3 H 8 permselectivity was not so high as we previously obtained [14], partly due to the choose of the permselectivity H 2 /C 3 H 8 here instead of H 2 /n-C 4 H 10 as before.…”