The molar flow rate of methane, 𝑛̇C H 4 , at the outlet of the Sabatier reactor (stream 2, see Figure ) for SPO as function of the inlet H2/CO2 ratio, 𝑟 in , is shown in Figure for various CO2 inlet molar flow rates, 𝑛̇C O 2 ,in . ). Furthermore, Figure shows that high H2/CO2 ratios allow to achieve the target at lower CO2 feed rates, while higher CO2 feed rates are beneficial in cases of small H2/CO2 ratios. This is expected, since both parameters allow to compensate for conversion and selectivity below 100%.