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  Global Journal of Physical Chemistry. Volume 2, Issue 1 (2011) pp. 39-47
  Research Article
Characterization of precursors of the catalysts of CO oxidation containing gerhardite phase Cu2(OH)3NO3
  Oleksandr A. Byedaa, Elena V. Ischenkoa,*, Тaras Yu. Gromovoyb, Vladyslav V. Lisnyaka,*  
a Chemical Department of Kyiv National Taras Shevchenko University, 64 Volodymyrska Street, 01601 Kyiv, Ukraine
b Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17 General Naumov Street, 03164 Kyiv, Ukraine

  Two series of precursors with different Cu : Co and Cu : Co : Fe ratio, used for preparation of the composite CuO/Cu2(OH)3NO3 catalysts of low temperature CO oxidation, were examined by means of Laser Desorption Ionization Time-of-Flight mass spectrometry (LDI-ToF MS), Temperature Programmed Desorption mass-spectrometry (TPD MS), Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray spectroscopy (SEM-EDS) and Fourier Transformed IR Attenuator Reflectance (FTIR-ATR) spectroscopy. No isomorphous substitution of Cu with Co or Fe in Cu2(OH)3NO3 structure was occurred, if thermohydrolysis route was used to prepare the precursors. According to the LDI-ToF MS, TPD MS and FTIR-ATR data, it was shown that the precursors contain the Cu2(OH)3NO3 phase. The results show that expected substitution of Cu for Co and/or Fe at the Cu sites of the Cu2(OH)3NO3 structure does not occur.It was found from LDI-ToF MS data that cobalt exists in the precursors composition exceptionally as Co(NO3)2 phase, while iron probably forms Fe2O3 phase. SEM-EDS examination confirms on the mm level the separation on Cu2(OH)3NO3 and Co(NO3)2 phases in the precursors of the series studied.
  LDI-ToF mass-spectrometry; TPD mass-spectrometry; FTIR-ATR spectroscopy; Laser Desorption / Ionization; Scanning Electron Microscopy; Energy Dispersive X-ray spectroscopy  

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