Physicochemical properties of aluminas obtained from different aluminum salts

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• 作者：M.L. Guzmá ; n-Castillo ; F. Herná ; ndez-Beltrá ; n ; J.J. Fripiat ; A. Rodriquez-Herná ; ndez ; R. Garcí ; a de Le&#xf3 ; n ; J. Navarrete-Bola&#xf1 ; os ; A. Tob&#xf3 ; n-Cervantes and X. Bokhimi
• 刊名：Catalysis Today
• 出版年：2005
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：2005
• 卷：107-108
• 期：Complete
• 页码：874-878
• 文件大小：136 K

摘要

Al₂O₃ materials were obtained by calcination of boehmite samples of varying crystallinity at 600 °C. Boehmites were obtained from Al₂(SO₄)₃·18H₂O or AlCl₃ under hydrothermal conditions and autogenous pressure at different synthesis temperatures (T_s = 40, 140 and 180 °C), and were studied by XRD, IR(Py), DTA and TGA. It was found that T_s is closely related to the physicochemical properties of boehmites, and thus of γ-Al₂O₃. Increased amounts of sulfur were detected in γ-Al₂O₃ for lower T_s using aluminum sulfate. Less-crystalline boehmites were obtained when using aluminum sulfate compared to aluminum chloride. While only Lewis acidity was found in γ-Al₂O₃ materials produced from aluminum chloride, aluminum sulfate produced both Lewis and Brönsted acidity, with the Brönsted/Lewis ratio depending on the crystallite size.