Publication Date:
2011-12-13
Description:
The ZSM-5 zeolite powders were prepared through in situ extraction (extraction and conversion in single step process) of silica from rice husk ash in the presence of other aqueous-based precursors (sodium aluminate and tetrapropyl ammonium hydroxide) following a simple hydrothermal condition at 130°C–170°C. The powders were characterized by X-ray diffraction (XRD), thermogravimetry analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, N 2 physisorption measurements, and field emission scanning electron microscopy (FESEM). Crystallizations of ZSM-5 were noticed at 130°C/96 h, 150°C/24 h, and 170°C/12 h. The exothermic peak at 422°C in DTA curve indicated the removal of tetrapropyl ammonium ions (TPA + ) used as structure directing agent (SDA). The vibration bands at around 550 and 1221 cm −1 indicated the presence of double 5-ring in ZSM-5. The 150°C–170°C-treated samples exhibited higher BET surface area and pore volume compared to those of 130°C-treated powders. The FESEM images showed coffin-shaped morphology of the powders, and their sizes increased with increase in both reaction temperature and time.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
