Adsorption of HF on gibbsite calcined at various temperatures: A solid-state NMR study of low-level fluorinated systems

Adsorption of HF on gibbsite calcined at various temperatures: A solid-state NMR study of low-level fluorinated systems
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不同温度下煅烧的三水铝石上 HF 的吸附:低含量氟化体系的固态核磁共振研究

DOI:
10.1016/j.jpcs.2021.110355
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发表时间:
2022
影响因子:
4
通讯作者:
Agbenyegah G
Agbenyegah G
中科院分区:
材料科学3区
文献类型:
--
作者:
Agbenyegah G

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通过27Al和19F固态核磁共振波谱和X射线衍射研究了拜耳三水铝石在不同温度下煅烧得到的低级氟化材料的氟化机理。三水铝石在 400、600、800 和 1000 °C 下煅烧,然后在 100 °C 下用无水 HF/N2 气体处理。基于 19F 魔角旋转 (MAS) NMR 光谱,提出了在 400、600 和 800 °C 下煅烧的氟化三水铝石表面上的三种类型的 Al-F 物质,这些峰在约 -132、-137 和 -163 ppm 处显示出峰,而在 1000 °C 下煅烧的氟化三水铝石的光谱显示出另外五个峰,在约-139、-164、-176、-183 和 -191 ppm。氧化铝中的氟化过程基于基本交换反应,其中 F− 根据其碱度取代表面 -OH 基团。 27Al MAS NMR和19F-27Al交叉极化-MAS实验证实了八面体Al物质的存在。
The fluorination mechanism of low-level fluorinated materials obtained by calcination of Bayer gibbsite at different temperatures was studied by27Al and19F solid-state NMR spectroscopy and X-ray diffraction. Gibbsite was calcined at 400, 600, 800, and 1000 °C followed by treatment with anhydrous HF/N2gas at 100 °C. Three types of Al–F species on the surface of fluorinated gibbsite calcined at 400, 600, and 800 °C are proposed on the basis of the19F magic angle spinning (MAS) NMR spectra, which show peaks at about −132, −137, and −163 ppm, while the spectrum of fluorinated gibbsite calcined at 1000 °C showed five additional peaks, at about −139, −164, −176, −183, and −191 ppm. The fluorination process in aluminas is based on elementary exchange reactions in which F−replaces surface –OH groups according to their basicity. The27Al MAS NMR and19F-27Al cross-polarization–MAS experiments confirmed the presence of octahedral Al species.
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