Figure 7.

Hydrogen separation efficiencies

Effect of promotor on separation efficiency in ${\text{H}}_2\text{O}-{\text{H}}_2$/${\text{CO}}_2$ hydrate system (A). Note that each bar corresponds to specific pressure and temperature at which hydrate formation was performed. Also, separation efficiency for different operating temperatures (B). Separation efficiency for different operating pressures (C). Note that some bars overlap with one another and only highest measured value at each thermodynamic condition is reported. The complete dataset is given in Table 2. The labels on the bars correspond to the labels in Table 2.