The reproducibility observed under identical conditions is a direct consequence of the consistent residence time of the gas in the reactor and the consistent rates of formation due to similar driving forces. The effect of driving force can be studied by comparing the capture rates of different feed gas compositions. Our data indicates that, under studied conditions, the formation rates at 10 mol% and 15 mol% are 3.1 and 4.8 times, respectively, that at 5 mol%. This relation is strikingly similar to 1:3.1:5.1, which is the corresponding ratio between y fg -y eq , i.e., the differences between feedgas and equilibrium concentration in the gas. This observation suggests that formation rates are directly proportional to the concentration difference between feed gas and equilibrium, which agrees well with kinetic models using that difference as the driving force for hydrate formation . Consequently, process conditions that enable small concentrations of CO 2 in the gas phase are automatically beneficial for achieving high capture rates, as are high CO 2 concentrations in the flue gas.