Real-time analysis of anodic mixed gas generated on carbon electrodes during TiO reduction in a LiCl-based salt at 650 °C
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The anode gas components produced during the electrolytic reduction of TiO was analyzed in this study in real time using a carbon anode in LiCl containing various Li2O and Li2CO3 concentrations under high-potential operation at 650 ◦C. A molten salt with 0.3 wt% Li2O under 6 V cell voltage predominantly generated CO2 until depletion of the initial oxygen ion source, after which Cl2 gas began to form. A molten salt containing 0.2 and 1.3 wt% Li2O and 1.3 wt% Li2CO3, respectively, also generated CO2 as the main anode gas, followed by CO, O2, and Cl2 gas generation. In contrast, a molten salt with 0.8 and 0.5 wt% Li2O and Li2CO3, respectively, initially generated CO, leading to carbonate accumulation, which gradually decreased as the concentration of generated CO2 increased and it became the dominant gas, while that of O2 remained constant (6–9%). Cl2 was predominantly generated upon depletion of the oxygen ion source in the salt. Cl2 reacted with carbonate ions in the salt, thus releasing CO2 gas and preventing carbonate accumulation in the salt. This study revealed that anode gas composition during electrolytic reduction with carbon anodes is critically influenced by the oxygen ion source concentration of the salt.
Abstract
The anode gas components produced during the electrolytic reduction of TiO was analyzed in this study in real time using a carbon anode in LiCl containing various Li2O and Li2CO3 concentrations under high-potential operation at 650 ◦C. A molten salt with 0.3 wt% Li2O under 6 V cell voltage predominantly generated CO2 until depletion of the initial oxygen ion source, after which Cl2 gas began to form. A molten salt containing 0.2 and 1.3 wt% Li2O and 1.3 wt% Li2CO3, respectively, also generated CO2 as the main anode gas, followed by CO, O2, and Cl2 gas generation. In contrast, a molten salt with 0.8 and 0.5 wt% Li2O and Li2CO3, respectively, initially generated CO, leading to carbonate accumulation, which gradually decreased as the concentration of generated CO2 increased and it became the dominant gas, while that of O2 remained constant (6–9%). Cl2 was predominantly generated upon depletion of the oxygen ion source in the salt. Cl2 reacted with carbonate ions in the salt, thus releasing CO2 gas and preventing carbonate accumulation in the salt. This study revealed that anode gas composition during electrolytic reduction with carbon anodes is critically influenced by the oxygen ion source concentration of the salt.