fig5
Figure 5. 23Na MQ-MAS-NMR of (A) glass and zeolites with different crystallization times, (B) 3 h, (C) 10 h and (D) 24 h[77]. Copyright © 2018 Elsevier Inc. All rights reserved. MQ: Multiple-quantum; MAS: magic angle spinning; NMR: nuclear magnetic resonance.
