V2O5/CeO2催化剂固相反应的Raman光谱研究

doi:10.3866/PKU.WHXB20100915

Abstract

Abstract:

We prepared V₂O₅ /CeO₂ catalysts with different V₂O₅ loadings (5% and 15%) by incipient wetness impregnation. Raman spectroscopy (514 and 325 nmexcitation laser lines), X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and N₂ adsorption were used to study the solid-state reaction between V₂O₅ and CeO₂. We found that the vanadium oxidation species reacted with ceria and formed a CeVO₄ phase on the surface of the sample that was calcined at 300 ℃, and the reaction was promoted at higher temperature. In addition, the absorption at 325 nm is stronger than that at 514 nm for the sample, therefore, 325 nm Raman spectroscopy is more sensitive to surface information than 514 nm Raman spectroscopy. Calcination at low temperature leads to unreacted V₂O₅ in the pores of CeO₂ but this is hindered by CeVO₄ on the sample surface. Therefore, the Raman band of V₂O₅ is present when using the 514 nmexcitation laser line and absent when using the 325 nmexcitation laser line.

Key words: Raman spectrum, V₂O₅ /CeO₂, CeVO₄, Phase transformation, Absorbance

WU Yan-Ni, GUO Ming, CHEN Fang, LUO Meng-Fei. Raman Spectroscopic Study on the Solid-State Reaction of V₂O₅/CeO₂ Catalyst[J]. Acta Phys. -Chim. Sin. 2010, 26(09), 2417-2421. doi: 10.3866/PKU.WHXB20100915

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Raman Spectroscopic Study on the Solid-State Reaction of V₂O₅/CeO₂ Catalyst

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Raman Spectroscopic Study on the Solid-State Reaction of V₂O₅/CeO₂ Catalyst