SYNTHESIS OF NANO SIZED MESOPOROUS γ - Al2O3POWDER FROM DOMESTIC HAMEDAN KAOLIN
A method for producing high surface area nano-sized mesoporous alumina from inexpensive Iranian kaolin as raw material is proposed. In this method, first, kaolin was purified; for purifying Kaolin, High Grade Magnetic Separation and leaching with HCl and chemical bleaching treatment by using sodium dithionite (Na 2 S 2O4) as reducing agent in acidic media (H 2SO 4) were used. Purified kaolin was calcined. After that, Al (hydr) oxide from acid -leachates of calcined kaolin was precipitated with ammonia, in presence of polyethylene glycol. Finally, a white powder of nano-sized alumina particles was obtained after calcination. BET surface area, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to characterize the sample. The resulting alumina with relatively high surface area (201.53 m 2 g -1) and narrow mean pore diameter (6.91 nm), consists of a particle size distribution ranging from 22 to 36 nm.
Nano , alumina , kaolin , Synthesis , precipitation
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