You can use below methods:

1. Gas separation membranes: These are permeable barriers that allow one gas to pass through while separating it from other gases. This can be used to separate hydrogen from other gases such as oxygen or nitrogen.

2. Cryogenic distillation: This process uses low temperatures to separate gases by taking advantage of differences in their boiling points.

3. Pressure swing adsorption (PSA): This is a process that uses adsorbents to selectively capture and separate gases.

4. Membrane gas separation: Membrane gas separation is a process that uses a semi-permeable membrane to separate gases based on the differences in their molecular size and solubility.

5. Absorption: This process uses a liquid or solid to absorb the desired gas, separating it from other gases.

6. Adsorption: This process uses a solid to adsorb the desired gas, separating it from other gases.