How the world's hydrogen is actually made from natural gas

Nature · Published 9 October 2026 Swipe more like this →

In short: Most hydrogen used today isn't extracted from water via electrolysis. Instead, it is manufactured in large central plants using steam-methane reforming. This mature industrial process transforms methane into fuel, but it requires intense heat and a complex sequence of chemical shifts to reach high purity.

In the United States, 95% of hydrogen production relies on natural gas reforming. The primary method is steam-methane reforming (SMR), a process where methane reacts with high-temperature steam—typically between 700°C and 1,000°C—under pressures of 3 to 25 bar. Because the reaction is strongly endothermic, significant heat must be supplied to drive the process forward. This method is often used to create syngas, which serves as a precursor for manufacturing methanol or ammonia. The reaction typically employs nickel-alumina catalysts to facilitate the chemical transformation.

The mechanism involves a two-step chemical transformation. First, methane and steam react in the presence of a catalyst to produce hydrogen and carbon monoxide. This is followed by the 'water-gas shift reaction,' where the carbon monoxide reacts with additional steam to yield more hydrogen and carbon dioxide. To achieve high purity, a final step called 'pressure-swing adsorption' is used to strip away the carbon dioxide and other impurities. This specific sequence ensures that the final output is essentially pure hydrogen. The water-gas shift reaction itself is mildly exothermic, releasing a small amount of heat.

While SMR is highly efficient, it is categorized by its environmental impact. 'Grey' hydrogen refers to production where the resulting carbon dioxide is released into the atmosphere. In contrast, 'blue' hydrogen occurs when that carbon dioxide is mostly captured and stored geologically. While using hydrogen from natural gas can reduce petroleum use by over 90% compared to gasoline vehicles, the industry is looking toward 'green' hydrogen—produced via electrolysis or solar thermal—and 'turquoise' hydrogen, produced through methane pyrolysis, for a zero-carbon future. This transition aims to move beyond fossil fuel reliance. Such methods represent the next evolution in low-carbon energy technology.

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