Figure 3
From: Microwave Heating-Assisted Catalytic Dry Reforming of Methane to Syngas

The Evolution of the Reactants and Syngas Components According to the DRM Operating Conditions. (a) The conversion of the DRM reactants CH4 and CO2 is enhanced by increasing the reaction temperature, which is in compliance with the endothermic nature of the reactions. Although the conversion of CH4 is superior to carbon dioxide since CO2 is the limiting reactant at CO2/CH4 < 1. (b) The syngas components, H2 and CO, demonstrate an increasing trend for selectivity at higher operating temperatures. However, CO selectivity is maximum at 650 °C due to the dominance of the reverse CO disproportionation reaction at lower temperatures.