Preparation and Characterization of Porous Yttrium Oxide Powders with High Specific Surface Area
来源期刊：JOURNAL OF RARE EARTHS2006年第1期
论文作者：Sun Weili Wang Yizheng Li Yongxiu Lin Xiaoyun Luo Junming
Key words：porous yttrium oxide; high surface area; explosive decomposition; rare earths;
Abstract: The porous cubic yttrium oxides with high specific surface area were prepared by the explosive decomposition of yttrium nitrate and its complex formed with methyl salicylate. The specific surface area and properties of powders synthesized at various temperatures were characterized using BET, X-ray diffraction (XRD), infrared spectra (IR), and scanning electron microscopy (SEM). The results indicate that the highest specific surface area is found to be 65.37 m2*g-1 at the calcination temperature of 600 ℃, and then decreases to 20.33 m2*g-1 with the calcination temperature rising from 600 to 900 ℃. The powders show strong surface activity for adsorping water and carbon dioxide in air, which also decreases with the rising calcination temperature. The drop both on the surface area and surface activity of samples at higher temperatures may be due to pore-narrowing(sintering) effects.
Sun Weili1，Wang Yizheng1，Li Yongxiu1，Lin Xiaoyun1，Luo Junming1
(1.Research Center for Rare Earths & Micro/nano Functional Materials, Nanchang University, Nanchang 330047, China)
Abstract:The porous cubic yttrium oxides with high specific surface area were prepared by the explosive decomposition of yttrium nitrate and its complex formed with methyl salicylate. The specific surface area and properties of powders synthesized at various temperatures were characterized using BET, X-ray diffraction (XRD), infrared spectra (IR), and scanning electron microscopy (SEM). The results indicate that the highest specific surface area is found to be 65.37 m2*g-1 at the calcination temperature of 600 ℃, and then decreases to 20.33 m2*g-1 with the calcination temperature rising from 600 to 900 ℃. The powders show strong surface activity for adsorping water and carbon dioxide in air, which also decreases with the rising calcination temperature. The drop both on the surface area and surface activity of samples at higher temperatures may be due to pore-narrowing(sintering) effects.
Key words:porous yttrium oxide; high surface area; explosive decomposition; rare earths;
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