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
复制标题
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
复制
发表时间:
2022
影响因子:
4
通讯作者:
Agbenyegah G
中科院分区:
文献类型:
--
作者:
Agbenyegah G
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.
登录
查看更多内容
影响因子:
6.2
作者:
V. Scalise;G. Scholz;R. Bertram;E. Kemnitz
通讯作者:
V. Scalise;G. Scholz;R. Bertram;E. Kemnitz
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Linus M. Perander;M. Stam;M. Hyland;J. Metson
通讯作者:
J. Metson
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
Don Donaldson;B. E. Raahauge
通讯作者:
B. E. Raahauge
影响因子:
3.7
作者:
Lukas Ahrem;G. Scholz;R. Bertram;E. Kemnitz
通讯作者:
Lukas Ahrem;G. Scholz;R. Bertram;E. Kemnitz
影响因子:
3.2
作者:
A. J. Vega
通讯作者:
A. J. Vega