Late last year, Audi announced it was partnering with the Dresden Energy Technology Corporation Sunfire to create synthetic diesel using CO2 and the company has now produced the first batch.

The Federal Ministry of Education and Research Professor Dr. Johanna Wanka put the first five liters into her personal Audi A8 3.0 TDI clean diesel quattro.


According to the German automaker, the only raw materials needed for the e-diesel are water and carbon dioxide and the CO2 is being supplied by a biogas facility.

The production process is a bit more complex then traditional diesel, with the water first being heated up to form steam before being broken down into hydrogen and oxygen by means of high-temperature electrolysis.


Afterwards, the hydrogen reacts with the CO2 in synthesis reactors and the result is a liquid made from long-chain hydrocarbon compounds, known as blue crude.

The blue crude can then be refined to yield the e-diesel. Audi also said that the synthetic fuel is free from sulfur and aromatic hydrocarbons and its high cetane number means it is readily ignitable.

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