Structural Effects of Cerium Oxides on Their Thermal Stability and Catalytic Performance in Propane Oxidation Dehydrogenation

doi:10.1016/S1872-2067(11)60404-X

Abstract

Abstract: The low-dimensional ceria nanorods and nanoparticles were prepared by wet chemical methods. The structural effect on the thermal stability of CeO₂ has been well investigated by in situ X-ray powder diffraction, transmission electron microscopy, and N₂ physisorption, revealing a superior stability of CeO₂ nanorods. CeO₂-supported V₂O₅ catalysts were prepared by the incipient wetness impregnation method and their catalytic performance in the oxidative dehydrogenation of propane was evaluated. The V₂O₅/CeO₂ nanorods catalysts display an improved selectivity for propene, probably arising from the immediate diffusion of propene product due to the open characteristic of rod-like structure.

Key words: cerium oxide, nanostructure, thermal stability, propane, oxidation dehydrogenation

GAO Xu-Feng, CHEN Chun-Lin, REN Shi-Yuan, ZHANG Jian, SU Dang-Sheng. Structural Effects of Cerium Oxides on Their Thermal Stability and Catalytic Performance in Propane Oxidation Dehydrogenation[J]. Chinese Journal of Catalysis, 2012, 33(7): 1069-1074.

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表 2 各 V2O5/CeO2 催化剂上丙烷氧化脱氢反应性能
Table 2 Propane oxidation dehydrogenation performance of V2O5/CeO2 catalysts
Sample TOF (h–1) C3H6 selectivity (%)
Nanorods Nanoparticles Nanorods Nanoparticles
1.0%V2O5/CeO2 9.1 6.8 11.5 8.4
2.5%V2O5/CeO2 10.7 5.9 35.0 20.3
5.0%V2O5/CeO2 10.1 7.6 62.4 40.2
10%V2O5/CeO2 5.6 6.0 69.7 61.3
Reaction conditions: catalyst 0.15 g, 450 °C, 8.3% propane, C3H8:O2 molar ratio = 1:1, total flow 30 ml/min, He as balance.
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