Facile synthesis of nano-sized NH4-ZSM-5 zeolites

High crystalline nano-sized NH4-ZSM-5 zeolites with a wide SiO2/Al2O3 ratio range were directly synthesized through seed-induced approach. The products were characterized using X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), N2-sorption experiment, thermal gravimetry (TG) analysis, ammonium temperature programmed desorption (NH3-TPD), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and 27Al and 29Si MAS NMR. The crystal sizes could be controlled by simply adjusting the amount of seeding suspension. The as-prepared NH4-ZSM-5 can be converted the acid H-form by a single calcination.

Nano-sized NH4-ZSM-5 zeolites with a wide SiO2/Al2O3 ratio range were directly synthesized through seed-induced approach. The crystal sizes could be controlled by simply adjusting the seeding gel amount.Figure optionsDownload as PowerPoint slideHighlights
► One-step synthesis of nano-sized NH4-ZSM-5 via seed-induced approach was reported.
► This approach decreased the organic template used.
► Crystal sizes could be controlled by tuning the seeding gel amount.
► The as-prepared NH4-ZSM-5 could be converted the acid H-form by simple calcination.
► The products showed similar properties to that synthesized in the alkali-system.