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The role of different types of CuO in CuO–CeO2/Al2O3 for total oxidation

Vladimir Galvita (UGent) , Matthias Filez (UGent) , Hilde Poelman (UGent) , V Bliznuk and Guy Marin (UGent)
(2014) CATALYSIS LETTERS. 144(1). p.32-43
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Abstract
Different types of copper oxide in CuO-CeO2/Al2O3 were investigated structurally and catalytically. Standard preparation lead to the presence of CuO monocrystals and Ce1-xCuxO2-x as evidenced by XRD, HRTEM and EDX. Washing with nitric acid removed the monocrystals, while leaving the Ce1-xCuxO2-x solid solution. The Fourier transformed Cu K patterns for the HNO3-washed catalyst showed a diminished second Cu shell, characteristic for Ce1-xCuxO2-x as well as for X-ray amorphous nano-sized CuAl2O4 spinel phase. XANES analysis and first shell Cu fitting confirmed this CuAl2O4 like structure outside Ce1-xCuxO2-x. By modeling the Ce K EXAFS signal in the washed sample, the amount of Cu in Ce1-xCuxO2-x was determined to be 18 +/- 6 %. Total oxidation of CO and C3H8 as model reactions showed little difference in activity between non-washed and washed CuO-CeO2/Al2O3, indicating that CuO monocrystals were hardly active at temperatures below 450 degrees C. XRD performed in situ during TPR and TPO showed that CeO2 in Ce1-xCuxO2-x added to the redox capacity of both CuO-CeO2/Al2O3 samples as it was partially reduced at 300 degrees C. At higher temperatures, the CuO monocrystals also participated in reaction, leading to a higher activity for the oxidation of CH4.
Keywords
MIXED-OXIDE, ETHYL-ACETATE, F-TEST, REDUCTION, SPECTROSCOPY, CuO, Solid solution of copper in ceria, Total oxidation, VOCs, Carbon monoxide, In situ XRD, EXAFS modeling, X-RAY-ABSORPTION, VOLATILE ORGANIC-COMPOUNDS, COPPER-OXIDE CATALYSTS, CO OXIDATION, CARBON-MONOXIDE

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Citation

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Chicago
Galvita, Vladimir, Matthias Filez, Hilde Poelman, V Bliznuk, and Guy Marin. 2014. “The Role of Different Types of CuO in CuO–CeO2/Al2O3 for Total Oxidation.” Catalysis Letters 144 (1): 32–43.
APA
Galvita, V., Filez, M., Poelman, H., Bliznuk, V., & Marin, G. (2014). The role of different types of CuO in CuO–CeO2/Al2O3 for total oxidation. CATALYSIS LETTERS, 144(1), 32–43.
Vancouver
1.
Galvita V, Filez M, Poelman H, Bliznuk V, Marin G. The role of different types of CuO in CuO–CeO2/Al2O3 for total oxidation. CATALYSIS LETTERS. 2014;144(1):32–43.
MLA
Galvita, Vladimir, Matthias Filez, Hilde Poelman, et al. “The Role of Different Types of CuO in CuO–CeO2/Al2O3 for Total Oxidation.” CATALYSIS LETTERS 144.1 (2014): 32–43. Print.
@article{5874211,
  abstract     = {Different types of copper oxide in CuO-CeO2/Al2O3 were investigated structurally and catalytically. Standard preparation lead to the presence of CuO monocrystals and Ce1-xCuxO2-x as evidenced by XRD, HRTEM and EDX. Washing with nitric acid removed the monocrystals, while leaving the Ce1-xCuxO2-x solid solution. The Fourier transformed Cu K patterns for the HNO3-washed catalyst showed a diminished second Cu shell, characteristic for Ce1-xCuxO2-x as well as for X-ray amorphous nano-sized CuAl2O4 spinel phase. XANES analysis and first shell Cu fitting confirmed this CuAl2O4 like structure outside Ce1-xCuxO2-x. By modeling the Ce K EXAFS signal in the washed sample, the amount of Cu in Ce1-xCuxO2-x was determined to be 18 +/- 6 \%. Total oxidation of CO and C3H8 as model reactions showed little difference in activity between non-washed and washed CuO-CeO2/Al2O3, indicating that CuO monocrystals were hardly active at temperatures below 450 degrees C. XRD performed in situ during TPR and TPO showed that CeO2 in Ce1-xCuxO2-x added to the redox capacity of both CuO-CeO2/Al2O3 samples as it was partially reduced at 300 degrees C. At higher temperatures, the CuO monocrystals also participated in reaction, leading to a higher activity for the oxidation of CH4.},
  author       = {Galvita, Vladimir and Filez, Matthias and Poelman, Hilde and Bliznuk, V and Marin, Guy},
  issn         = {1011-372X},
  journal      = {CATALYSIS LETTERS},
  keyword      = {MIXED-OXIDE,ETHYL-ACETATE,F-TEST,REDUCTION,SPECTROSCOPY,CuO,Solid solution of copper in ceria,Total oxidation,VOCs,Carbon monoxide,In situ XRD,EXAFS modeling,X-RAY-ABSORPTION,VOLATILE ORGANIC-COMPOUNDS,COPPER-OXIDE CATALYSTS,CO OXIDATION,CARBON-MONOXIDE},
  language     = {eng},
  number       = {1},
  pages        = {32--43},
  title        = {The role of different types of CuO in CuO--CeO2/Al2O3 for total oxidation},
  url          = {http://dx.doi.org/10.1007/s10562-013-1144-x},
  volume       = {144},
  year         = {2014},
}

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