(Updated November 2021)
- Hydrogen is increasingly seen as a key component of future energy systems if it can be made without carbon dioxide emissions.
- It is starting to be used as a transport fuel, despite the need for high-pressure containment.
- The use of hydrogen in the production of liquid transport fuels from crude oil is increasing rapidly, and is vital where tar sands are the oil source.
- Hydrogen can be combined with carbon dioxide to make methanol or dimethyl ether (DME) which are important transport fuels.
- Hydrogen also has future application as industrial-scale replacement for coke in steelmaking and other metallurgical processes.
- Nuclear energy can be used to make hydrogen electrolytically, and in the future high-temperature reactors are likely to be used to make it thermochemically.
- The energy demand for hydrogen production could exceed that for electricity production today.
Hydrogen is not found in free form (H2) but must be liberated from molecules such as water or methane. It is therefore not an energy source and must be made, using energy. It is already a significant chemical product, about half of annual pure hydrogen production being used in making nitrogen fertilisers via the Haber process and about one-quarter to convert low-grade crude oils (especially those from tar sands) into liquid transport fuels. There is a lot of experience handling hydrogen on a large scale, though it is not as straightforward as natural gas.
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