Recystallization of HCl-Treated Y Zeolite with Short Range Order

doi:10.3724/SP.J.1088.2012.10828

Abstract

Abstract: A series of acid-treated Y zeolite crystals with different crystallinities were obtained by treating commercial Y zeolite in HCl solution. The acid-treated Y zeolites were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and ²⁷Al and ²⁹Si MAS NMR. The results indicated that the acid-treated Y zeolites were almost amorphous but some short-range-order aluminosilicate species were retained. The acid-treated Y zeolites were recrystallized at 150 ^oC with 0.3 mol/L NaOH solution by the steam-assist crystallization method, and the pure mordenite zeolite products with the morphology from aggregate of nano-rod to micron-sized crystal were obtained within a suitable Si/Al ratio range. Their BET surface area is higher than 400 m²/g and micropore volume is up to 0.19 cm³/g.

Key words: Y zeolite, hydrochloric acid treatment, local range order, mordenite, steam-assisted crystallization

SONG Yan-Mei, REN Nan, TANG Yi. Recystallization of HCl-Treated Y Zeolite with Short Range Order[J]. Chinese Journal of Catalysis, 2012, 33(1): 192-198.

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