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World of Science: Audi creates diesel out of thin air

 
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Darqcyde



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PostPosted: Tue Apr 28, 2015 1:26 am    Post subject: World of Science: Audi creates diesel out of thin air Reply with quote

https://www.audi-mediaservices.com/publish/ms/content/en/public/pressemitteilungen/2015/04/21/fuel_of_the_future.html

the official Audi press release wrote:
Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel.

After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high‑quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof. Dr. Johanna Wanka put the first five liters into her official car, an Audi A8 3.0 TDI clean diesel quattro*, this Tuesday. “This synthetic diesel, made using CO2, is a huge success for our sustainability research. If we can make widespread use of CO2 as a raw material, we will make a crucial contribution to climate protection and the efficient use of resources, and put the fundamentals of the “green economy” in place,” declared Wanka.

The Dresden energy technology corporation sunfire is Audi’s project partner and the plant operator. It operates according to the power‑to‑liquid (PtL) principle and uses green power to produce a liquid fuel. The only raw materials needed are water and carbon dioxide. The CO2 used is currently supplied by a biogas facility. In addition, initially a portion of the CO2 needed is extracted from the ambient air by means of direct air capturing, a technology of Audi’s Zurich‑based partner Climeworks.

Reiner Mangold, Head of Sustainable Product Development at Audi, sees Audi e‑diesel and Audi e‑fuels in general as an important component that complements electric mobility: “In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long‑distance mobility with virtually no impact on the climate. Using CO2 as a raw material represents an opportunity not just for the automotive industry in Germany, but also to transfer the principle to other sectors and countries.”

Production of Audi e‑diesel involves various steps: First, water heated up to form steam is broken down into hydrogen and oxygen by means of high-temperature electrolysis. This process, involving a temperature in excess of 800 degrees Celsius, is more efficient than conventional techniques because of heat recovery, for example. Another special feature of high-temperature electrolysis is that it can be used dynamically, to stabilize the grid when production of green power peaks.

In two further steps, the hydrogen reacts with the CO2 in synthesis reactors, again under pressure and at high temperature. The reaction product is a liquid made from long‑chain hydrocarbon compounds, known as blue crude. The efficiency of the overall process – from renewable power to liquid hydrocarbon – is very high at around 70 percent. Similarly to a fossil crude oil, blue crude can be refined to yield the end product Audi e‑diesel. This synthetic fuel is free from sulfur and aromatic hydrocarbons, and its high cetane number means it is readily ignitable. As lab tests conducted at Audi have shown, it is suitable for admixing with fossil diesel or, prospectively, for use as a fuel in its own right.

The Federal Ministry of Education and Research is supporting the sunfire project, which started in May 2012. Construction work on the facility in Dresden‑Reick kicked off in July 2013 and the plant was commissioned on November 14, 2014. The plant is set to produce over 3,000 liters (792.5 US gal) of Audi e‑diesel over the coming months. Audi is sunfire’s exclusive partner in the automotive sector.

Over and above the partnership with sunfire, Audi has been active in the development of CO2‑neutral fuels – Audi e‑fuels – since 2009. The Audi e‑gas plant in Werlte, Lower Saxony, already produces Audi e‑gas (synthetic methane) in a comparable manner; drivers of the Audi A3 Sportback g‑tron* can fill up on it using a special fuel card. Audi is also conducting joint research into the synthetic manufacture of Audi e‑gasoline with Global Bioenergies, of France. In a further project, Audi has joined forces with the U.S. company Joule, which uses microorganisms to produce the synthetic fuels Audi e‑diesel and Audi e‑ethanol.

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WheelsOfConfusion



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PostPosted: Tue Apr 28, 2015 1:34 am    Post subject: Reply with quote

So it's a further incremental refinement over existing implementations of the Fischer-Tropsch process, I take it? Basically just a more advanced trick to doing the same thing fuel-constrained powers (read: Germany) were doing back in WWII.
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Darqcyde



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PostPosted: Tue Apr 28, 2015 2:41 am    Post subject: Reply with quote

I'm taking it that the real innovations as being the use of CO2 over CO and figuring out how to make it profitable. Also, there's not other outside elements needed (like coal or natural gas).

This explains it a little better, but I can understand why they're not giving out too much on it: http://blog.caranddriver.com/powering-your-car-with-water-audi-realizes-the-green-dream-synthesizes-diesel-from-h20/

Quote:
The process involves heating water to 800 degrees Celsius, creating steam. Electricity—from a green-energy power source, naturally, biomass in this case—heats the water, and the resulting high-temperature electrolysis breaks it down into hydrogen and oxygen. The oxygen is released, and the hydrogen is combined with CO2 taken from the atmosphere. Under high heat and pressure, the two synthesize to create a liquid known as blue crude. The blue crude is refined into what Audi calls e-diesel.

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Arc Tempest



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PostPosted: Tue Apr 28, 2015 3:29 am    Post subject: Reply with quote

Darqcyde wrote:
I'm taking it that the real innovations as being the use of CO2 over CO and figuring out how to make it profitable. Also, there's not other outside elements needed (like coal or natural gas).

This explains it a little better, but I can understand why they're not giving out too much on it: http://blog.caranddriver.com/powering-your-car-with-water-audi-realizes-the-green-dream-synthesizes-diesel-from-h20/

Quote:
The process involves heating water to 800 degrees Celsius, creating steam. Electricity—from a green-energy power source, naturally, biomass in this case—heats the water, and the resulting high-temperature electrolysis breaks it down into hydrogen and oxygen. The oxygen is released, and the hydrogen is combined with CO2 taken from the atmosphere. Under high heat and pressure, the two synthesize to create a liquid known as blue crude. The blue crude is refined into what Audi calls e-diesel.


Do we actually know that it's profitable? Or that it doesn't have astronomically conversion costs for that matter?
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Mr Gary



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PostPosted: Tue Apr 28, 2015 7:33 pm    Post subject: Reply with quote

I think you're all overlooking the most important item of information in this post.

Quote:
To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof. Dr. Johanna Wanka


Dr Wanka, every body!
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