Posted on 04/30/2026 9:14:06 PM PDT by Red Badger
The concept uses hydrogen, oxygen, and argon to enable stable combustion.
Aristidis Dafis and Hermann Rottengruber, PhD, with a one-cylinder experimental engine. Jana Dünnhaupt / Uni Magdeburg
Researchers in Germany have recently unveiled a hydrogen-powered engine that could challenge diesel in some of the toughest applications by operating without emissions and achieving efficiency levels above 60 percent.
Developed by a research team at the Otto-von-Guericke University Magdeburg, the so-called hydrogen cycle engine operates in a closed loop and reuses most of its working gases after each cycle.
The project was led by Hermann Rottengruber, PhD, a professor at the university’s Institute for Engineering of Products and Systems (IEPS). It was also backed by the Federal Ministry for Economic Affairs and Energy of Germany.
“This approach could become particularly important in applications where engines must operate under high loads for long periods, be highly robust, and deliver significant power,” Rottengruber pointed out.
A zero emissions engine
The innovative concept utilizes a carefully balanced mix of hydrogen, oxygen and argon. While hydrogen serves as the energy source, oxygen enables the reaction, and argon, which is a chemically inert noble gas, acts as a stable carrier.
Because argon does not burn or react under operating conditions, it helps create more controlled thermodynamic conditions inside the engine. This, as a result, improves the system’s efficiency and stability.
Unlike a traditional combustion system, most of the gas mixture in this engine stays inside the system and is reused. It’s cooled, processed and fed back into the cycle after each power stroke.
The system removes only specific byproducts, while it separates and liquefies the hydrogen involved in the reaction. This unique design enables the engine to run without producing conventional exhaust emissions.
For the project, the team tested multiple variants of the so-called Argon Power Cycle engine on a dedicated test bench, along with their colleagues from WTZ Roßlau gGmbH, a research institute specializing in engine technology, energy conversion and future fuels. They also validated performance through detailed computer simulations.
Clean power solution
The results revealed that the engine could combine high output with exceptional efficiency (over 60 percent), as it is capable of delivering power levels comparable to those of diesel engines. This makes it especially attractive for heavy-duty applications where both performance and durability are critical.
These include sectors where battery-electric solutions often struggle as a result of weight, range limitations, and charging infrastructure requirements, such as long-haul trucks, agricultural machinery, construction equipment and stationary power generators.
But, according to Rottengruber, the closed-loop design could also offer economic advantages. “In our assessment, the closed system could be more cost-effective over realistic operating periods than an open hydrogen combustion engine,” he stated in a press release.
This, the expert believes, is partly because of the elimination of expensive exhaust treatment systems and the high efficiency of the process, which could offset the engine’s greater technical complexity over time.
Still, the current concept faces limits in power density, as only a certain amount of hydrogen can be injected during each cycle. The team also noted that the carbon dioxide could accumulate in the system, for instance, through the combustion of lubricants.
“Both of these factors could affect efficiency and engine performance and must be taken into account in further developments,” Rottengruber elaborated. The concept is already attracting interest from the industry. “Leading manufacturers of marine propulsion systems have already expressed strong interest, as pressure is growing, particularly in this sector, to make climate-neutral solutions available by 2050,” he concluded.
The article makes me think of the Hindenburg, also built by the Germans. I’m quite happy with our gas and diesel engines.
From the article: “The team also noted that the carbon dioxide could accumulate in the system, for instance, through the combustion of lubricants.”
A properly designed piston and piston rings can result in zero burning of oil. I’ve owned two such vehicles. A 1970 Ford Torino that burned zero oil, as the level on the dipstick stayed the same for 2,000 miles. And our currently owned 1997 Silverado with 197,000 miles that also burns zero oil.
I also have a CaseIH diesel tractor with 4,000 hours that burns zero oil.
My only concern with hydrogen is the safe storage and more importantly the distribution and metering systems to the engine intake. I believe leaks would be more apt to occur in those systems than the storage tank.
And how is that hydrogen manufactured and at what cost? This is a big fat nothing burger.
I’d hate to have to rewire that thing
Water vapor (the exhaust from the combustion of hydrogen) is the most potent of the greenhouse gasses.
Ahhhh the Hydrogen Engine. I first read about it when I was eight, in Readers Digest back in 1966. Gee whiz I thought, can’t wait!!!
Universe contain immerse amount of hydrogen!
Unfortunately. there is no free hydrogen on Earth!
All is contained in compound, like water and it takes more energy to extract it than any engine can deliver.
The second law of thermodynamics!
Funny, how liberals, always claiming the science, spend so much resources trying to fight the science laws!
I have a 4 cylinder John Deere diesel in an air compressor that literally and truly loses no oil over 300 hours. I mean not so much as an eyelash on the dipstick. The machines air end is the same. It takes 2 and a half gallons of 6000 hour oil and even though it is specified to push some fraction of oil out the nozzle I never have to top it up. I kept up with filter and oil changes since I bought it new. It is the only machine I have encountered in the industry that doesn’t push a quart a month out the airend and past the piston rings.
He should hire a bodyguard.
Explosively.
“Something wrong here. Heat engines are limited by the heat sink temperature and the high temperature.”
I thought the efficiency of a piston engine was more-or-less a function of the compression ratio. That’s why diesels are more efficient than gas engines.
Diesels get around knock by squirting in the fuel near top dead center rather than having it come in mixed with air during the intake stroke.
Des the use of hydrogen/argon permit a greater compression ratio?
Tell me where I’m inaccurate here which I probably am.
You can extract it from water. But it is very expensive with hyrdolysis, and the energy required to do so is not practical. But yes, Hydrogen is one of the most abundant atoms on earth.
Oh, good, at least it runs on commonaly available gasses you can buy at any big box store.
/Sarc
Our masters don’t care about pollution. They care about killing our mobility. Water vapor will be named a pollutant.
EC
Bkmk
True, but water vapor cannot accumulate in the atmosphere, as evidenced by the fact that when I go outside later today I am very likely to be covered with water literally falling out of the sky. The atmosphere has a limited capacity for water vapor.
When I see a Hydrogen station I’ll think about it.
Zero emissions is bullshit. How do we make hydrogen? It just doesn’t appear. There is an industrial process to do so, and it takes energy and creates emissions. If we could somehow tap into the bullshit spewed on the public and turn it into an energy source, we would have a limitless supply.
No, by any measure oxygen is far more abundant on earth, to name only one such element.
Stored? How is the Hydrogen produced and at what cost? This engine may rival a diesel engines efficiency, but I seririously doubt it will be able to match diesels cost.
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