is displayed for the SPO and the RO setup over the respective inlet ratios 𝑟 in . In the RO setup the trend in CO2 conversion is similar to that of the SPO. For 𝑟 in < 4, H2 is the stoichiometrically limiting component. Hence, even at full H2 conversion the available CO2 is only consumed stoichiometrically, leading to an increased fraction of CO₂ at the reactor outlet and to the recycling of CO₂. At the same time, CO2 conversion (Eq. ( )) increases with H2 availability and thereby with 𝑟 in . For 𝑟 in > 4 (stream (in), Figure ), H2 is fed in stoichiometric excess, which leads to the recycling of unreacted H2 and an increased CO2 conversion. Additionally, the methane selectivities (Eq. ( )) for both setups are provided in Figure (in the SI). this conversion is achieved with setting the ratio 𝑟 in to 4.7. In the RO setup, the reactor inlet ratio 𝑟 1 depends on the ratio in the recycle streams, 𝑟 15 , and the inlet ratio, 𝑟 in . Thus, the H2/CO2 ratio at the reactor inlet (stream 1 in Figure ) exceeds that at the overall inlet when feeding H2 in stoichiometric excess. A ratio 𝑟 1 = 4.7 for the RO setup is achieved by setting 𝑟 in to 4.09.