Focusing on the mass of CO 2 captured, the effect of the concentration difference as an important driving force for hydrate formation becomes apparent once more. Higher mass flow rate results in higher CO 2 fraction in the gas along its path through the bed. Since a larger deviation from the equilibrium concentration implies a greater driving force, the driving force for hydrate formation is also larger. This effect naturally supports maintaining capture rates. A smaller capture rate implies a higher CO 2 fraction in the gas, which in turn implies a higher driving force and stabilizes the capture rate. The effect of this feedback loop can be seen in Fig. (b), which shows an almost linear increase in captured CO 2 over 3 hours of experiments. Likewise, capture dynamics remain highly reproducible over the full duration of the experiments and 15 capture-regeneration cycles. The slightly higher deviation between cycles observed in the mass signal is due to the amplifying effect of mass flow rates only.