Figure is showing the TPR results for the applied Ru-based catalyst, which is compared to a typical Ni/Al2O3 catalyst, which was found to be active at 240 °C in an earlier study . The reduction of Ru starts slightly above 50 °C and is completed within the operation window achievable in PFA and PTFE reactors. The reduction of the Ni/Al2O3 catalyst starts at 200 °C and exhibits a peak above the maximum operation temperature of the polymers. Ni or Co based catalysts are therefore not suitable for the application in the polymeric reactors used here due to their high reduction temperatures above the operating temperature of both PTFE and PFA. However, Ru-based catalysts are intentionally used for low temperature hydrogenation, because of their activity at temperatures as low as 200 °C . The sorption measurements of the Ru based catalyst are shown in Table . The surface area of the Accu ® Sphere support is lower than for a typical γ-alumina supported Ni-catalyst, which is given as comparison. Consequently, the active surface area per gram catalyst is also lower. Interestingly, the sorption capacity and thus the affinity of the gases CO2 and H2 is remarkably different for the two catalyst materials. While the Ni-based catalyst has a higher affinity to CO2 compared to H2, the Rubased catalyst displays a higher affinity to H2. The different specific sorption capacities of both catalyst materials are caused by the nominal metal loading (1 wt.-% Ru and 10 wt.-% Ni). In our previous study we investigated different support materials for Ru and found the H2 sorption capacity for Ru supported on TiO2 (P25/20, Evonik) to be 7.5 µmol g -1 , which is in line with the capacity determined here.