X射线光电子能谱
钼
结合能
氧化态
氢
化学
光电发射光谱学
分析化学(期刊)
氧化还原
无机化学
材料科学
金属
原子物理学
核磁共振
有机化学
物理
作者
Jeong-Gil Choi,Levi T. Thompson
标识
DOI:10.1016/0169-4332(95)00317-7
摘要
The surface properties of Mo oxides (MoO2 and MoO3) were investigated using X-ray photoelectron spectroscopy (XPS). As-prepared MoO3 showed two well resolved spectral lines at 232.5 and 235.6 eV, which were assigned to the Mo 3d5/2, 3d3/2 spin-orbit components, respectively. After the sample was reduced with H2 at 673 K for 3 h, 76% of the MoO3 present on the surface was transformed to MoO2. Hydrogen reduction of MoO2 produced a new state (Moδ+, 0 < δ < 4) at a binding energy of 228.7 ± 0.2 eV. We assigned this new state to Mo3+ based on our binding energy assignments for Mo0, Mo4+, Mo5+, and Mo6+. The concentration of Moδ+ state increased with increasing reduction time and this state was suggested to contain hydrogen, which may be a necessary requisite for desulfurization and denitrogenation reactions.
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