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Powder Technology, Vol.87, No.1, 87-92, 1996
Texture Properties of Yttrium Oxides Generated from Different Inorganic Precursors
The texture properties of four samples of Y2O3 (cubic structure) generated from different inorganic precursors (hydrated Yttrium acetate, Y(CH3COO)(3) . 4H(2)O; nitrate, Y(NO3)(3) . 5H(2)O and oxalate, Y-2(C2O4)(3) . 8H(2)O) at different temperatures have been studied using BET, pore size distribution, cumulative surface area, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that samples obtained from both acetate at 700 degrees C (55 m(2)/gm) and nitrate at 500 degrees C (58 m(2)/gm) are very similar in surface area and pore structure (a wider spectrum of mesoporosity); i.e., good precursors for catalyst and catalyst support. The third sample obtained from oxalate at 700 degrees C exhibits a lower surface area ( 12 m(2)/gm) and different in pore structure; i.e., a good precursor for ceramics and superconductor manufacture. For Y2O3 generated from nitrate, the increase in calcination temperature from 500 to 700 degrees C caused a decrease in the surface area from 58 to 20 m(2)/g, and in the microporosity development. The SEM and particle size calculations have been used to assess the surface properties of Y2O3 samples.
Keywords:ALUMINA