Continuous measurements are initialized by pressurizing the reactor with the calibration gas using the pressure gauge of the gas cylinder, subsequently to the preparatory flushing process. This leads to a pressure wave that propagates through the fixed bed until it reaches the flow controller at the reactor outlet (FIC), which is already set to a fixed value within the range of 0.5 to 2.0 slm. Once the reactor is fully pressurized the capture period of a pressure swing cycle starts. It is monitored by continuously measuring the inlet and outlet mass flows as well as the mole fraction of CO 2 at the reactor outlet. This allows for the calculation of the CO 2 capture rate, which, upon aggregation, yields the mass of CO 2 captured in the mixed hydrate. After the capture period, which lasts for 180 minutes in our typical pressure swing cycles, the regeneration period is started by dissociating the mixed hydrate. To this end, the reactor inlet is closed while the outlet flow is maintained at the value used for capture. This results in a steady pressure drop which ultimately destabilizes the mixed hydrate and triggers its dissociation into gas and ice.