Abstract
Processes of the multi-stage decomposition of maleic acid and Li, Na, and Cd maleates in an inert atmosphere are studied via thermal analysis with synchronous analysis of the composition of the released gases. Reaction mechanisms are proposed according to the data on the mass loss stages determined via thermal analysis, gaseous products, and the final solid decomposition products. It is shown that when heated to 700°C, Li and Na carbonates incorporated into the porous carbon matrix are the final products. Above 350°C, cadmium is reduced from oxide to metal and evaporates to form a porous carbon residue as the only product of thermolysis. All carbon products are X-ray amorphous. Maleic acid decomposes completely into gaseous products in the range of 133–239°C. The maleate ion is more stable in the structure of lithium maleate than in free maleic acid, and Na and Cd cations reduce its stability.
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Funding
This work was supported by the Russian Science Foundation, grant no. 18-42-06201; the Government of the Russian Federation, Order 211 of March 16, 2013 and agreement no. 02.A03.21.0011; and by the RF Ministry of Education and Science, as part of State Task no. 4.5749.2017/7.8.
X-ray phase and thermal analysis, and electron-microscopic studies were performed at the Nanotechnology scientific and educational center of South Ural State University.
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Translated by V. Selikhanovich
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Sakthi Dharan, C.P., Polozov, M.A., Polozova, V.V. et al. Features of the Thermolysis of Li, Na, and Cd Maleates. Russ. J. Phys. Chem. 94, 1311–1318 (2020). https://doi.org/10.1134/S0036024420070250
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DOI: https://doi.org/10.1134/S0036024420070250