CO2 is also subject to methanation, although to a lower extent compared to CO. So, the reaction of CO2 with H2 was also studied, at first without CO in the feed. Thereby, CO was not detected for T < 200 °C, and even for T > 200 °C the content was less than 25 ppm. The possible role of the RWGS and the question whether CO2 is directly converted to methane or via RWGS and subsequent CO methanation is discussed in detail in Section 3.3. F