Catalytic activity of copper-ceria catalysts supported on different zeolites for CO oxidation

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• 作者：Dong Zhang ; Huiping Zhang ; Ying Yan
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：33
• 期：6
• 页码：1846-1854
• 全文大小：2,487 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220
• 卷排序：33

文摘

Copper-ceria catalysts for CO oxidation supported on 4A, 5A, NaX and NaY zeolites were prepared by incipient wetness impregnation and excess-solution impregnation. Catalysts were characterized by SEM, EDX, XRD, N2 adsorption-desorption, H2-TPR and XPS. Results revealed that the catalysts were greatly affected by zeolites and preparation method. EDX results indicated the metal loading of 4A-ES (5.1 wt% Cu, 15.7 wt% Ce), 5A-ES (5.9 wt% Cu, 19.2% Ce), NaX-ES (11.7wt% Cu, 4.2 wt% Ce) and NaY-ES (11.0 wt% Cu, 7.9 wt% Ce) greatly varied. TPR results suggested that the peak at around 195 °C was presented in NaX-ES and 4A-IW, standing for dispersed copper species that is very active for CO oxidation. The catalytic activity of 4A-ES and NaX-ES was the best among catalysts made by excess-solution impregnation, demonstrated by the lowest T₅₀ at 127 and 129 °C, respectively. The catalytic activity of catalysts made by incipient wetness impregnation was worse than that of catalysts made by excess-solution impregnation, examined by the T₅₀ of 4A-IW and NaX-IW at 128 and 192 °C, respectively.KeywordsCO OxidationCopper-ceria CatalystZeoliteIncipient Wetness ImpregnationExcess-solution Impregnation