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Hydrogen’s many colours

January 5, 20235:00 AM Reuters0 Comments

Major industries, including energy, steel and chemicals, are looking at how to switch to hydrogen as a fuel to help to reduce carbon emissions. Equinor and RWE said on Thursday they planned to develop an industrial value chain for the production and use of low-carbon hydrogen.

Hydrogen is one of the most abundant elements in the universe, but traditional methods of producing it at scale release large amounts of carbon dioxide.

There are ways to produce the gas that are more climate-friendly and hydrogen has been colour-coded to reflect its carbon footprint.

Hydrogen extracted using power from renewable energy such as wind or solar is “green.”

Here are details about green, grey, blue and turquoise hydrogen:

Green hydrogen

Produced using renewable energy, which could include offshore wind and solar, to power electrolysis plants, which split water into hydrogen.

Green hydrogen can be stored, piped, or carried by tankers to consumers, for example to serve hydrogen filling stations.

Grey hydrogen

Grey hydrogen is extracted from coal or natural gas using steam-methane reforming, which is currently the standard industry process.

Blue hydrogen

Blue hydrogen is produced in the same way as grey hydrogen but with CO2 emissions captured and then injected into underground or subsea storage such as depleted oil and gas fields. It is often presented as a transitional approach until green hydrogen output can be scaled up.

Turquoise hydrogen

Also called low-carbon hydrogen, and so far very small scale, this is hydrogen generated from natural gas but using pyrolysis – the gas is passed through molten metal, producing solid carbon as a byproduct with useful applications.

Pink hydrogen

Generated through electrolysis powered by nuclear energy.

Equinor

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