Single gas permeance performance
of the high silica SSZ-13 zeolite
membrane (Si/Al = 79) was greatly improved by acid post-treatment
in this work. Effects of post-treatment conditions, such as post-treatment
temperature (25, 60, 80, and 100 °C) and time (0–2 h),
acid concentration (0–0.6 H+ mol/L), and acid type
(HCl, HNO3, H2SO4, and H3PO4), on the single gas permeance performance of the membrane
were investigated in this study. Morphology and structure of the acid
post-treated membrane is identical with the fresh high silica SSZ-13
zeolites by advance characterization results, only the amorphous on
the zeolites surface is removed and filled into the intercrystalline
by medium acid post-treatment, which could improve the gas permeance
performance of the membranes greatly. When the post-treatment temperature,
time, acid type, and H+ concentration are 25 °C, 0.5
h, H2SO4, and 0.4 mol/L, the CO2/CH4, CO2/N2, H2/CH4, and H2/SF6 ideal selectivity of the post-treated
high silica SSZ-13 zeolite membrane are increased to 68, 10, 29, and
126 at 0.2 MPa and 25 °C, respectively.