Affiliation:
1. Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) UMR 7504 CNRS – Université de Strasbourg 23 Rue du Loess 67200 Strasbourg France
2. IFP Energies nouvelles (IFPEN) Lyon Establishment Rond-Point de l'Echangeur de Solaize BP 3-69360 Solaize France
3. Physicochimie des Electrolytes et Nanosystèmes interfaciaux Laboratory (PHENIX) CNRS and University Pierre et Marie Curie 75252 Paris cedex 5 France
Abstract
AbstractThis study explores the morphological and structural transformation of boehmite (AlOOH) into transition aluminas during calcination, a pathway crucial for diverse industrial applications. The primary focus is on the topotactic transformation of boehmite into γ‐Al2O3 and its subsequent transitions into higher temperature polymorphs, culminating in α‐Al2O3. Utilizing a combination of in situ X‐ray diffraction, in situ and ex situ transmission electron microscopy, 27Al solid‐state nuclear magnetic resonance, thermogravimetric analysis, nitrogen physisorption, and mercury porosimetry, this work provides insights into the morphological and structural reordering during the calcination process. Furthermore, the study highlights the significant impact of thermal processing on the morphological evolution of boehmite and transition aluminas, characterized by changes in pore structure sizes and shapes. These findings offer valuable insights for optimizing the properties of alumina‐based materials for specific applications.