Integrated Study of the Calcination Cycle from Gibbsite to Corundum

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• 作者：Matthew R. Hill ; Timothy J. Bastow ; Steven Celotto ; Anita J. Hill
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：May 29, 2007
• 年：2007
• 卷：19
• 期：11
• 页码：2877 - 2883
• 全文大小：132K
• 年卷期：v.19,no.11(May 29, 2007)
• ISSN：1520-5002

文摘

A comprehensive picture of the gibbsite (Al(OH)₃) to corundum (-Al₂O₃) calcination process hasbeen developed by multi-technique characterization of an integrated sample set. In 100 C calcinationstages, ²⁷Al nuclear magnetic resonance (NMR), differential thermal analysis (DTA), X-ray diffraction(XRD), and nitrogen sorption surface area measurements were employed to elucidate the structure andchemistry of these calcinates. In addition, positron annihilation lifetime spectroscopy (PALS) has beenused to study the defective nature of these aluminas. By exploiting the complementarity of PALS, ²⁷AlNMR, and N₂ sorption, new links were established between particle morphology, local atomic coordination,and surface defect chemistry.