Adsorption of HF and HCl on the β-AlF3 (100) surface

被引:15
作者
Bailey, C. L. [1 ]
Wander, A. [1 ]
Mukhopadhyay, S. [2 ]
Searle, B. G. [1 ]
Harrison, N. M. [1 ,2 ]
机构
[1] SERC, Daresbury Lab, Sci & Technol Fac Council, Computat Sci & Engn Dept, Warrington WA4 4AD, Cheshire, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
关键词
D O I
10.1039/b718733e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The current study employs hybrid-exchange density functional theory to investigate the adsorption of HF and HCl to under-coordinated Al ions on the beta-AlF3 ( 100) surface. It is shown that the geometries of the adsorbates are strongly dependent on coverage. Furthermore, the adsorption of HCl leads to a number of distinct structures that have very similar energies. It is proposed that this result may explain the high catalytic activity of aluminium fluoride and aluminium chloro-fluoride surfaces towards chlorine-fluorine exchange reactions. The stretching and bending frequencies of the H-F and H-Cl bonds at half and full monolayer coverage are also calculated and the vibrational spectrum is found to be strongly dependent on the adsorption site and the coverage. The vibrational frequency shifts provide, therefore, a mechanism for experimentally characterising these surfaces.
引用
收藏
页码:2918 / 2924
页数:7
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