Coal gasification by CO2 gas bubbling in molten salt for solar/fossil energy hybridization

Coal gasification with CO2 (the Boudouard reaction: C+CO2=2CO, Delta1Hdegree=169.2 kJ/mol at 1150 K), which can be applied to a solar thermochemical process to convert concentrated solar heat into chemical energy, was conducted in the molten salt medium (eutectic mixture of Na2CO3 and K2CO3, weight ration=1/1) to provide thermal storage. When CO2 gas was bubbled through the molten salt, higher reaction rates were observed compared to the case without CO2 gas bubbling (CO2 gas was streamed over the surface of the molten salt).