Abstract

The conversion of gibbsite to boehmite via hydrothermal treatment at 200°С in 1.5 wt % HCl is studied by X-ray powder diffraction, IR spectroscopy, Brunauer–Emmett–Teller analysis, scanning (SEM) and transmission (TEM) electron microscopy. The steps of the process are identified. Gibbsite is split in an acidic medium, with its specific surface area increasing up to 150 m²/g, into thin lamellas that have a disordered boehmite structure. Needle-shaped boehmite crystals are formed from thin elongated lamellas of diverse sizes due to the oriented overlaying and cross-linking with the elimination of weakly bound water and structural perfection.

中文翻译：

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酸性介质如何影响勃姆石的水热合成

摘要

通过X射线粉末衍射，IR光谱，Brunauer-Emmett-Teller分析，扫描（SEM）和透射（TEM）电子显微镜研究了在1.5 wt％HCl中于200°C的水热处理将三水铝石转变为勃姆石。确定了过程的步骤。菱铁矿在酸性介质中分裂，其比表面积增加至150 m ² / g，形成薄薄的薄片，薄薄的薄板具有勃姆石结构。针状勃姆石晶体由各种尺寸的细长细长薄片形成，这是由于定向覆盖和交联，消除了弱结合水和结构的完善。