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Hydrogen is made from hydrocarbons by reactions known as steam reforming. The most common source material is methane. At high temperatures (between 700 and 1100 degrees C)

CH4 + H2O --> CO + 3H2

The temperature is then lowered to about 260 degrees C and further hydrogen is produced:

CO + H2O --> CO2 + H2

This second step is known as the water gas shift reaction.

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