The acid properties of H-ZSM-5 as studied by NH3-TPD and 27Al-MAS-NMR spectroscopy The acid properties of H-ZSM-5 zeolites with different SiO 2/Al 2O 3 ratios (30, 50, 80, 150, 280 and 1000) were examined by means of the temperature progr... L Rodríguez-González,F Hermes,M ...
amine to the substrate to yield a zwitterionic tetrahedral intermediate ( T A ± ) in the first step, followed by deprotonation to form T A - in the second step, which, in the third step, converted to product by H 2O and/or conjugate acid of the base (BH +), assisted MeS ...