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

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.

摘要采用湿化学法制备了低维氧化铈的纳米棒和纳米颗粒, 通过原位 X 射线粉末衍射、透射电镜和 N2 物理吸附等技术研究了氧化铈纳米结构对其热稳定性的影响. 结果表明, 氧化铈纳米棒的稳定性更高. 采用浸渍法制备了氧化铈负载的氧化钒催化剂, 并用于丙烷氧化脱氢反应中, 发现以氧化铈纳米棒为载体的催化剂表现出更高的丙烯选择性, 这可能是由于棒状结构的开放性有利于产物丙烯的直接扩散.

This communication presents the change of cerium oxides nanostructures with the thermal treatment, being important to make clear the relationship between structure and thermal stability and catalytic performance.Figure optionsDownload as PowerPoint slide