Active Oxygen in Oxide Catalytic Systems for Environmental Catalysis |
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Authors: | Stoyanka Christoskova Maria Stoyanova and Dragomir Vasilev |
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Institution: | (1) Department of Inorganic and Analytical Chemistry, Szczecin University of Technology, Al. Piastow 42, 71-065 Szczecin, Poland |
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Abstract: | The effect of the synthesis conditions of individual and modified with Mn Ni- and Co-oxide systems on the content and the
mobility of their active oxygen has been studied by means of chemical and IR spectral analyses. The results obtained show
that the main part of the active oxygen in Ni-oxide system is located on the catalyst’s surface (Os
* is approximately 73% of the total active oxygen), while Co-oxide system is characterized by much lower surface active oxygen
content. Ni- and Co-oxide systems modified with Mn have comparatively higher active oxygen content as compared to the individual
ones. Data of the IR spectral analysis reveal that Mn, as a modifying component, affects the mobility of the active oxygen,
the latter contributing to the activity of oxide systems in oxidation processes. The high content of loosely bonded active
oxygen formed during the synthesis determines a high catalytic activity of the studied samples in reactions of complete oxidation
in the low temperature region. |
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