Highly efficient reduction of CO2 by magnesium and calcium hydride producing H2‐mixed CH4: Effect of the particle size and the molar ratio of reactant.

In this study, we investigated the reduction of CO2 using magnesium and calcium hydride (AeH2, Ae = Mg or Ca), in the process of which clean H2‐mixed CH4 fuel is produced. The result of this investigation shows that the particle size of AeH2 and AeH2/CO2 molar ratio can greatly affect the molar percentage value and reaction yield of methane. In general, the magnesium or calcium hydride as‐milled for 2 hr is enough active for reduction of CO2 to CH4. When the molar ratio of AeH2/CO2 is set to 2:1, the methanation effect is optimal for both reaction systems. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]