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

Abstract

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.