A Facile Hydrothermal Conversion of Rice Husk Ash to ZSM-5 Zeolite Powders

作者：Naskar Milan K^*; Kundu Debtosh; Chatterjee Minati

来源：Journal of the American Ceramic Society, 2012, 95(3): 925-930.

DOI：10.1111/j.1551-2916.2011.04988.x

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 degrees C170 degrees C. The powders were characterized by X-ray diffraction (XRD), thermogravimetry analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, N2 physisorption measurements, and field emission scanning electron microscopy (FESEM). Crystallizations of ZSM-5 were noticed at 130 degrees C/96 h, 150 degrees C/24 h, and 170 degrees C/12 h. The exothermic peak at 422 degrees 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 degrees C170 degrees C-treated samples exhibited higher BET surface area and pore volume compared to those of 130 degrees 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.

• 出版日期2012-3