Morphological effect of lanthanum-based supports on the catalytic performance of Pt catalysts in crotonaldehyde hydrogenation

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• 作者：Fengjun Hou ; Huahua Zhao ; Jun Zhao ; Jian Yang…
• 关键词：Lanthanum ; Nanorods ; Platinum ; Selective hydrogenation ; Nanostructured catalysts
• 刊名：Journal of Nanoparticle Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：18
• 期：3
• 全文大小：3,300 KB
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• 作者单位：Fengjun Hou (1) (2)
  Huahua Zhao (1)
  Jun Zhao (1)
  Jian Yang (1)
  Liang Yan (1)
  Huangling Song (1)
  Lingjun Chou (1)
  
  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China
  2. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X

文摘

Rod-like and particle-like La₂O₂CO₃ and La₂O₃ were obtained via morphology-preserved thermal transformation of the La(OH)₃ precursors. La₂O₂CO₃- and La₂O₃-supported Pt catalysts were prepared by impregnation method and tested in the liquid-phase crotonaldehyde hydrogenation reaction. The textural and physicochemical properties of the samples were studied by a series of techniques including XRD, TG-DSC, N₂ adsorption–desorption, TEM and HRTEM, IR spectrum, H₂-TPD, and H₂-TPR. Even after 600 °C reduction, Pt particles of about 0.8–2.8 nm interplayed with support surface to form Pt-doped interface, thereby preventing the catalysts from migration and affording a high dispersion of platinum. The specific exposed crystal-facets and surface oxygen species depending on the shape of the support affected the preferential deposition of Pt species and the metal-support interaction. Thus, Pt catalysts performed different physicochemical properties and catalytic performance relying on the morphology and structure of the supports. During the cycle experiment, severe deactivation was observed for NP-supported catalysts with an increased selectivity due to the aggregation and growth of Pt particles. Meantime, the NR-supported catalysts retained relatively high reactivity as a consequence of the crystal-facet confinement of rod-shaped lanthanum supports.