The molar ratio of CO 2 at the reactor outlet exhibits a recurring behavior. Right after the capture phase is started, the CO 2 fraction decreases rapidly until it hits a minimal concentration and rises steadily after that. The time it takes to reach the minimum coincides well with the theoretical residence time, which is computed by dividing the approximated gas mass in the reactor by the mass inflow rate. This behavior can be explained using the remaining capacity for hydrate formation in the packed bed. The very first control volume entering the reactor will encounter a fresh packed bed. It takes exactly the residence time for this volume to propagate to the outlet. Every other control volume of gas following after will encounter a more reacted bed which offers less sites to be occupied as well as diffusion barriers limiting the uptake rate. The gas already present in the reactor at the start is also exposed to a fresh packed bed, however, can react with the downstream fraction of the bed only.