Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO(2)/Al(2)O(3) ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO(2) and CH(4)) of the high silica SSZ-13 zeolite membrane was decreased with the SiO(2)/Al(2)O(3) ratio in the precursor synthesis gel, while the ideal CO(2)/CH(4) selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H(2)O/SiO(2) and RNOH/SiO(2) ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail. Medium H(2)O/SiO(2) and RNOH/SiO(2) ratios in the initial synthesis gel were crucial to prepare the good CO(2) perm-selective SSZ-13 zeolite membrane. When the molar composition of precursor synthesis gel, crystallization temperature and time were 1.0 SiO(2): 0.1 Na(2)O: 0.1 TMAdaOH: 80 H(2)O, 160 °C and 48 h, CO(2) permeance and ideal CO(2)/CH(4) selectivity of the SSZ-13 zeolite membrane were 0.98 × 10(−7) mol/(m(2)·s·Pa) and 47 at 25 °C and 0.4 MPa. In addition, the SiO(2)/Al(2)O(3) ratio of the corresponding SSZ-13 zeolite was 410 by X-ray fluorescence spectroscopy.