Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane

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• 作者：Wen-Xia Zhang ; Yan Liang ; Jian-Wei Luo ; Ai-Ping Jia…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：51
• 期：13
• 页码：6488-6496
• 全文大小：1,247 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：51

文摘

Ordered Cr₂O₃ nanorods (Cr₂O₃-R) and Cr₂O₃ nanoparticles (Cr₂O₃-P) were prepared by a hard template method with SBA-15 and a deposition–precipitation method, respectively. These catalysts were tested for the fluorination of 2-chloro-1,1,1-trifluoroethane (HCFC-133a) to synthesize 1,1,1,2-tetrafluoroethane (HFC-134a). It was found that both catalysts were very selective, with a HFC-134a selectivity of 98 %. However, the Cr₂O₃-R catalyst had an area specific reaction rate of 0.012 μmol m−2 s−1 at 320 °C, which was much higher than that on the Cr₂O₃-P (0.005 μmol m−2 s−1). The enhanced activity of the Cr₂O₃-R was attributed to its higher content of Cr(VI) species compared to that in the Cr₂O₃-P, which was evidenced by the hydrogen temperature-programmed reduction and X-ray photoelectron spectroscopy results. Besides, the Cr₂O₃-R catalyst had a higher surface acid density (0.076 mmol m−2) than the Cr₂O₃-P (0.068 mmol m−2), which could be another reason for its better performance.