Investigation of phase formation in the system Fe2+/Co2+/O2/H2O
| Autor: | Mariya Savchenko, Liliya Frolova, Aleksey Khlopytskyi, Iurii Galivets, Alona Derimova |
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| Rok vydání: | 2016 |
| Předmět: |
Inorganic chemistry
Iron oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Oxygen Industrial and Manufacturing Engineering Catalysis chemistry.chemical_compound Management of Technology and Innovation Qualitative inorganic analysis Electrical and Electronic Engineering Chemical composition 0105 earth and related environmental sciences Magnetite Applied Mathematics Mechanical Engineering 021001 nanoscience & nanotechnology Alkali metal Computer Science Applications chemistry Control and Systems Engineering 0210 nano-technology Cobalt |
| Zdroj: | Eastern-European Journal of Enterprise Technologies. 6:64-68 |
| ISSN: | 1729-4061 1729-3774 |
| Popis: | The dispersed iron oxide compounds are widely used as magnet carriers, pigments, catalysts, sorbents. Therefore, the study of phase formation in the system Fe 2+ /Co 2+ /O 2 /H 2 O, as well as the study of the influence of the basic oxidative environment parameters on the phase composition of iron (III) oxides over a wide pH range, and obtaining precipitates with a given chemical composition appear to be urgent. As a result of the studies involved, it was found that in the system Fe 2+ /Co 2+ /O 2 /H 2 O with constant cobalt content, the alkali consumption rate and the rate of product formation increase with increasing effective air flow rate. At constant rate of oxidation the oxidation time is reduced with the increase of cobalt content in the system. The phase composition of the resulting compounds is determined by the mode of OHCP (dynamic or static). Formation of Со x Fe 3-x O 4 spinel structure occurs at pH 11–12 and air flow rate 4 min -1 . In the presence of cobalt ions 3+, the rate of iron 2+compounds oxidation by atmospheric oxygen increases, because of their catalytic action. |
| Databáze: | OpenAIRE |
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