Raman Spectroscopy of Vanadium Oxide Supported on Alumina
Raman Spectroscopy of Vanadium Oxide Supported on Alumina
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氧化铝负载氧化钒的拉曼光谱
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
I. Wachs
中科院分区：
文献类型：
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作者：
G. Deo;F. Hardcastle;M. Richards;A. Hirt;I. Wachs
用拉曼光谱研究了不同氧化铝相(γ，δθ和α)负载的氧化钒的分子状态。发现负载的氧化钒在不同的氧化铝相上形成了分子分散的覆盖层。然而，表面氧化钒相的分子状态取决于氧化铝载体的性质。这种变化主要是由于表面杂质的存在，特别是氧化钠。表面氧化钠含量随着形成不同过渡氧化铝相(α，δ-θ，γ)所需的焙烧温度的升高而增加。表面氧化钒相在γ-Al_2O_3上由聚合物四面体和扭曲八面体组成，在δ，θ-Al_2O_3上由单体四面体和扭曲八面体组成，在α-Α_2O_3上由单体四面体和扭曲八面体组成。
The molecular state of vanadium oxide supported on different alumina phases (γ , δθ, and α) was investigated with Raman spectroscopy. The supported vanadium oxide was found to form a molecularly dispersed overlayer on the different alumina phases. The molecular state of the surface vanadium oxide phase, however, was dependent on the nature of the alumina support. This variation was primarily due to the presence of surface impurities, in particular sodium oxide. The surface sodium oxide content was found to increase with the calcination temperature required to form the different transitional alumina phases (α, δ-θ, γ). The surface vanadium oxide phase consists of polymeric tetrahedra and distorted octahedra on γ-Al2O3, monomeric tetrahedra and distorted octahedra on δ,θ-Al2O3, and monomeric tetrahedra on α-Αl2O3.