However, the CO2
conversion reduces with respect to the CO2/CH4 ratio at high temperatures
due to a limitation in the amount of methane to react
with CO2. It is also found that the CO2 conversion decreases with
increased temperature in a range of 400–600 C for the studied
range of CO2/CH4 ratios. This can be explained by the exothermic
nature of the water gas shift and CO disproportionation reactions,
which favor low temperatures, causing more CO2 generation and