fig5

Figure 5. ¹³C MAS NMR spectrum of the retained organic intermediates in three ZSM-11 zeolites after continuous flow ¹³CH₃OH reaction at 350 °C for 1 min (A) and 30 min (B); respectively. GC-MS chromatograms of retained organic species obtained from the reaction of ¹³C methanol for 1 min at 300 °C (C) and 350 °C (D); respectively; the inserted histogram represents the relative proportion of higher and lower polyMBs estimated from corresponding GC-MS chromatograms. Total ¹³C-labeled content (%) in the retained aromatics (xylene to hexaMB) for MTO over L-ZSM-11 (E) and S-ZSM-11 (F) at 350 °C.