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IDTechEx Consider the Potential of E-Fuels

Growth in global energy consumption has caused CO2 and greenhouse gas (GHG) missions to rise, in turn causing an increase in average global temperatures. The combustion of fossil fuels including coal, oil, and natural gas, has been a key driver behind this, providing the underlying driver for the production and use of non-fossil alternative fuels that can help reduce emissions.

While progress is being made in the power sector with the integration of renewable power sources, and in light-duty on-road transport with battery electric vehicles, other sectors have been slower to adopt low-carbon technologies. See the report “Electric Vehicles: Land, Sea and Air 2021-2041” for IDTechEx’s latest research on electric vehicles. Electrification is key to any low-carbon strategy, providing the most efficient means to utilize renewable power sources. However, complete electrification is unlikely to be feasible for areas such as heating, shipping, or aviation. Taking aviation as an example, this can be easily understood given the much lower energy density of battery technology compared to kerosene (a major component of jet-fuel). Instead, sustainable gaseous and liquid fuels are going to be needed, with two main routes available: biofuels and synthetic electro-fuels (e-fuels), including green hydrogen.

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Biofuels are widely used today, primarily by blending bioethanol and biodiesel for on-road transport fuels. To date, food crops have been the major feedstock. Sugars can be fermented to produce ethanol, while transesterification of vegetable oils produces biodiesel. Longer-term, more advanced feedstocks from cellulosic or woody feedstocks, or from waste materials, can help limit the impact on land use, competition with food production, and minimize lifecycle emissions from biofuel production. Nevertheless, concerns remain over the true sustainability biofuels offer and limits on feedstock availability.

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An alternative to biofuels may therefore be needed and electro-fuels (e-fuels or synthetic e-fuels) could provide an alternative means to produce drop-in liquid and gaseous fuels. Electro-fuels, or e-fuels, consist of fuels that are produced using hydrogen from water electrolysis, referring to the process rather than the fuel itself, and incorporates the terms power-to-X, X being a gaseous or liquid product. Hydrogen itself can be considered an e-fuel, along with methane and ammonia as other power-to-gas fuels. However, H2 in particular is difficult to store and transport and, even liquid H2, has a comparatively low volumetric energy density. As such, liquid fuels are likely to be preferred for hard to abate transport sectors. Drop-in liquid fuels, such as gasoline, diesel, or jet fuel (power-to-liquid), can be obtained by combining hydrogen with a carbon source, such as from direct-air-capture (DAC). While there are various routes to produce a final e-fuel, many will rely on syngas, a combination of H2 + CO, as an intermediate. Syngas can be produced through the combination of H2 and CO2 in a water gas shift reactor and further processed into drop-in fuels, though it is also possible to produce syngas directly, for example, though co-electrolysis of CO2 and steam. Methanol may be another important intermediate, produced either from syngas or again, directly via electrochemical or thermochemical routes, to be used as a fuel additive or as a precursor to a variety of fuels and chemicals. See the brand new IDTechEx report “Sustainable Alternative Fuels: 2021-2031”.

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