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

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

1.
1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China;
2. Institute of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China

Received Date: 31 March 2010
Available Online: 14 July 2010
Fund Project: 国家自然科学基金(20873125)资助项目 (20873125)

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.
- Raman spectrum,
- V₂O₅ /CeO₂,
- CeVO₄,
- Phase transformation,
- Absorbance
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Raman Spectroscopic Study on the Solid-State Reaction of V₂O₅/CeO₂ Catalyst