Effects of metal substitution in transition-metal phosphides (Ni1−xM′x)2P (M′ = Cr, Fe, Co) studied by X-ray photoelectron and absorption spectroscopy
作者： Peter E. R. Blanchard , Andrew P. Grosvenor , Ronald G. Cavell , Arthur Mar
DOI: 10.1039/B904250D
关键词: XANES 、 Electronegativity 、 Photoemission spectroscopy 、 Phosphide 、 Absorption (chemistry) 、 X-ray photoelectron spectroscopy 、 Absorption edge 、 Analytical chemistry 、 Absorption spectroscopy 、 Chemistry
摘要: Mixed-metal variants (Ni1−xM′x)2P (M′ = Cr, Fe, Co; 0 ≤ x 1) of the binary phosphide Ni2P, a well-known hydrodesulfurization and hydrodenitrogenation catalyst, have been examined by X-ray photoelectron (XPS) absorption (XANES) spectroscopy. The P 2p3/2 binding energies K-edge in (Ni1−xCrx)2P, (Ni1−xFex)2P, (Ni1−xCox)2P are lower than with shifts becoming more pronounced greater difference electronegativity between Ni/M′. These influenced primarily intraatomic effects. However, secondary interatomic effects also implicated Ni 2p3/2XPS spectra, which show enhanced satellite intensities, K- L-edge indicating charge transfer from M′ to electronegative atoms. This phenomenon was confirmed metal XANES revealed higher energy as degree increases. spectra pre-edge feature whose intensity decreases Ni2P (Ni0.8Cr0.2)2P, supporting occurrence Cr Ni.
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