3.4. H2/CO2 gas separation tests
In order to further evaluate the effects of the proposed different-sized seeding in combination with variable temperature/time method on the quality of tubular ZSM-5 zeolite membranes, the gas separation tests using H2/CO2 binary mixture were utilized at room temperature. We selected four membranes to study ho w these methods improve in membrane quality. The membranes M3, M7, M9, and M14 as representative of the single-layer, dual-layer, triple-layer, and variable temperature/time methods were selected, respectively. The results of H2/CO2 separation tests are shown in Fig. 10.