The identical experimental procedure is conducted for both polymeric reactors. A scheme of the experimental program is shown in Figure . The catalyst is reduced in-situ at 200 °C and ambient pressure (about 960 mbar). Herein, 10 mLSTP min -1 of H2 are diluted with 90 mLSTP min -1 N2. Every set of process condition, including the reduction step, is held for 8 h. After reduction, the feed gas stream is switched to synthesis gas with a H2:CO2 ratio of 4:1 and the first parameter variation is conducted. The first set of process conditions with a 4:1 syngas ratio at 200 °C is used as reference conditions (Reference I). The temperature is varied in 20 K steps from 160 up to 220 °C and again down to 160 °C. After the temperature variation, the process conditions are again set identical to Reference I as a second reference (Reference II) to evaluate the catalyst stability with respect to varying temperature conditions. Afterwards, the pressure is increased to 5 bar. The process conditions of Reference III are 5 bar pressure, 4:1 syngas ratio and 200 °C. Then the syngas ratio is varied from 3:1 to test under-stoichiometric ratios and to 5:1 for testing over stoichiometric ratios. Reference IV is used to evaluate deactivation compared to Reference III in regards to varying gas inlet compositions.