A continuously operated fixed-bed reactor is used for the catalytic testing of the iron-based catalysts. A filter frit with a pore size of 5 μm is inserted into the tubular reactor to position the powdered catalyst. Prior to the reaction, the reduced catalyst was removed from the reduction furnace, exposed to air and 200 mg of catalyst was weighed into the tubular reactor. In each experiment the temperature was varied between 30 °C and 90 °C at 22.5 bar. The feed composition corresponds to that of an acetylene removal unit (ARU) under front-end conditions (Table ). A scheme of the experimental setup is included in the supporting information (Figure ).