Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Конференция: Scientific research of the SCO countries: synergy and integration; Beijing; Beijing
Год издания: 2025
Идентификатор DOI: 10.34660/INF.2025.83.66.135
Ключевые слова: aluminum, electrolyzer, exhaust gases, perfluorocarbons, thermodynamic analysis, gibbs energy, electrode potential
Аннотация: The change in the Gibbs energy of the reaction occurring during aluminum production at the anode and taking into account the joint formation of carbon oxides CO2 and CO and perfluorocarbons CF4 and C2F6 during the normal technological process, and the electrode potential of the anode relative to aluminum are calculated. It is shownПоказать полностьюthat the formation of perfluorocarbons together with carbon oxides during electrolysis is thermodynamically possible even near the equilibrium potential of the anode (≈ 1.2 V) and even more so when the back EMF at industrial anode current densities reaches ≈1.8 V. However, according to measurements on industrial electrolyzers during normal electrolysis, the concentration of perfluorocarbons in the exhaust gases is estimated at an average of 0.02%. The discrepancy between the results of thermodynamic analysis and measurements is explained by the reactions of CF4 and C2F6 with water vapor directly or with the participation of oxygen on the path of gases from the anode base to the sampling point.
Журнал: Scientific research of the SCO countries: synergy and integration
Номера страниц: 155-164
Место издания: Beijing