fig4

Figure 4. 2D ¹H-¹H DQ-SQ MAS NMR spectra of dehydrated HZSM-5 (A); HZSM-5-100-2 (B); HZSM-5-200-2 (C); HZSM-5-300-2 (D); HZSM-5-400-2 (E); HZSM-5-500-2 (F); (G-J) structure of proton signals with different ¹H chemical shifts where the letters from A to H corresponded to eight proton signals from the high filed to the low field, respectively.