Abstract
Studies have shown that doping carbonates with silica destabilizes the liquid phase by reducing the temperature window over which the mixture resides in a molten state. This work demonstrates that liquid-phase disruption is caused by silicate formation in the melt due to reactions between carbonate and silica. These results were verified using differential thermal analysis (DTA), X-ray diffraction, and thermogravimetric analysis, all of which pointed to the same conclusion. The exact amount of silica produced was measured using DTA, which precisely matched the theoretical yield. These results are particularly relevant to the direct carbon fuel cell (DCFC) when carbonate is used as an electrolyte and coal char is used as a fuel, given that silica is an abundant mineral in high-rank coals. In this situation, liquid-phase disruption would destabilize the carbonate electrolyte, thus having a deleterious impact on the DCFC.
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