fig2
Figure 2. SEM images of S-1 ZMNs synthesized at different pH values of the aging gel and different crystallization times: (A) pH = 9.5, 48 h; (B) pH = 8.5, 72 h; (C) pH = 8.0, 72 h; and (D) pH = 7.0, 168 h. Crystallization temperature: 120 °C (A and B) or 150 °C (C and D). SEM: Scanning electron microscope; ZMNs: zeolite macro-nanosheets.
