Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

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• 作者：Anne Heponiemi ; Said Azalim ; Tao Hu ; Ulla Lassi
• 关键词：CWAO ; BPA ; Silver ; Cerium ; Zirconium ; XPS
• 刊名：Topics in Catalysis
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：58
• 期：14-17
• 页码：1043-1052
• 全文大小：594 KB
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• 作者单位：Anne Heponiemi (1)
  Said Azalim (1)
  Tao Hu (1)
  Ulla Lassi (1) (2)
  
  1. Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
  2. Kokkola University Consortium Chydenius, P.O. Box 567, 67701, Kokkola, Finland
  
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028

文摘

Catalytic wet air oxidation of an aqueous solution, bisphenol A (BPA), was carried out at 160 °C and at 20 bar of air in a batch reactor. Silver catalysts (2.5 wt%) prepared by wet impregnation and complexation on commercial CeO₂ in addition to Ce_0.85Zr_0.15O₂ and Ce_0.2Zr_0.8O₂ sol–gel mixed oxides were synthesized and used as catalysts in the reaction. Characterizations of the catalysts were performed by using FESEM, XRD, BET, XPS and ICP–OES techniques. Residual BPA concentration was analyzed by using an UV–Vis technique and organic compound content was measured via the total organic carbon method. Commercial CeO₂ showed a smaller specific surface area and a larger crystallite size than laboratory prepared Ce–Zr mixed oxides. The highest BPA removal (76 %) was achieved after 3 h with CeO₂, Ce_0.85Zr_0.15O₂ and Ag/Ce_0.85Zr_0.15O₂ catalysts revealing that the addition of silver had no effect on the catalytic activity of the pure supports. However, the loading of active metal to the supports by complexation decreased the adsorption of the BPA during the heating period and hence the Ag/Ce_0.85Zr_0.15O₂ prepared via complexation was the most active catalyst with only 1 % adsorption of BPA. Moreover, the activity of the catalysts was not related to the surface area of the samples. According to the ICP–OES analysis of the terminal water samples, leaching of the silver was occurred during oxidation experiments explaining the behavior of Ag catalysts in the reaction. Keywords CWAO BPA Silver Cerium Zirconium XPS