Syngas Production by Hydrogenation of Calcium Carbonate with Reverse Water Gas Shift Catalyst

CO formation was observed through hydrogen reduction of calcium carbonate (CaCO3) with the calcite structure at high temperatures. The amount of produced CO increased with higher hydrogen partial pressure. Therefore, we considered that CO2 formed by the pyrolysis of CaCO3 was converted to CO by the reverse water gas shift (RWGS) reaction. The effect of physical mixing of catalyst with CaCO3 was examined using copper–zinc–aluminum (Cu–Zn–Al) catalyst, iron–chromium (Fe–Cr) catalyst, and perovskite oxide supported platinum (Pt/BZY) catalyst. The CO production rate and CO yield increased significantly by using all catalysts. Pt/BZY catalyst was found to be stable with no methane by-production.