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Global Journal of Physical Chemistry. Volume 2, Issue 1 (2011) pp. 39-47
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Research Article
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Characterization of precursors of the catalysts of CO oxidation containing gerhardite phase Cu2(OH)3NO3
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Oleksandr A. Byedaa, Elena V. Ischenkoa,*, Тaras Yu. Gromovoyb, Vladyslav V. Lisnyaka,*
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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
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Abstract |
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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.
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Keywords |
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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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