Patterns of Formation of Binary Cobalt–Magnesium Oxide Combustion Catalysts of Various Composition
Khussain B. Sass A. Brodskiy A. Rakhmetova K. Torlopov I. Zhylkybek M. Baizhumanova T. Tungatarova S. Khussain A. Zhurinov M. Kenessary A. Tyulebayeva R. Logvinenko A. Narimanov Y.
July 2024Multidisciplinary Digital Publishing Institute (MDPI)
Catalysts
2024#14Issue 7
In order to establish the formation patterns of the Co–Mg oxide system, samples with different Co:Mg ratios and heat treatment temperatures were synthesized and studied. A study of the samples confirmed the phase transition of MgxCo2–xO4 spinels into the corresponding solid solutions at 800–900 °C. The similarity of the formation patterns for different compositions is shown. The rocksalt oxide in low-temperature samples is an anion-modified paracrystalline phase that forms a “true” solid solution only upon spinel decomposition. The TPR profiles of the decomposed Co3O4 spinel show surface Co3O4 peaks and a wide peak corresponding to the well-crystallized CoO, while partial Co3O4 TPR up to 380 °C results in dispersed and amorphous CoO. The high-temperature non-stoichiometric samples are poorly reduced, indicating their low oxygen reactivity. Spinel reoxidation after heat treatment to 1100 °C by calcination at 750 °C showed complete regeneration for MgCo2O4–Co3O4 samples and its absence in case of an excess of MgO relative to stoichiometry.
cobalt oxide , magnesium oxide , reoxidation , solid solution , spinel
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D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, 142, Kunaev Str., Almaty, 050010, Kazakhstan
Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, 71, Al-Farabi Str., Almaty, 050040, Kazakhstan
Kazakh Institute of Oil and Gas, 506/99, Seifullin Ave., Almaty, 050000, Kazakhstan
D.V. Sokolsky Institute of Fuel
Department of Chemistry and Chemical Technology
Kazakh Institute of Oil and Gas
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