Several automakers are working to ensure the survival of internal combustion engines for as long as possible. To achieve this, they’re looking for new fuels and new ways to capture the pollutants emitted by such engines. At the Japan Mobility Show, Mazda unveiled a promising concept called Mazda Mobile Carbon Capture, showcased through the Mazda Vision X Concept Coupe 2025.
- This component could capture more CO₂ than the engine emits
• This technology could extend the lifespan of combustion engines
• The project is still far from commercialization
A system that could capture more CO₂ than it emits
Mazda is experimenting with a bold idea: combining an algae-derived biofuel with an exhaust system theoretically capable of making an internal combustion engine carbon negative. In other words, not only would emissions be reduced, but the car could also capture more carbon dioxide than is generated during the fuel’s production process.
This special exhaust system would act as a kind of filter, absorbing CO₂ expelled by the engine and neutralizing the gases released during the creation of the biofuel—at least, in theory.
Mazda Mobile Carbon CaptureWhile it’s unlikely that this concept will reach production anytime soon, it raises intriguing questions about the future of carbon neutrality. Imagine a hybrid-electric vehicle running on microalgae-based fuel, this is where the CO₂-capturing exhaust system would come into play.
How it works, according to Carbon Capture Journal
As explained by Carbon Capture Journal, a publication specializing in environmental innovation:
“The process of producing biofuel requires energy, and CO₂ may be emitted to generate this energy. The amount of CO₂ emitted for energy generation represents roughly 10% of that released during the fuel’s combustion. Consequently, biofuels can reduce total CO₂ emissions by about 90% compared to fossil fuels.
Moreover, the CO₂ released when burning biofuel could be offset by capturing part of it during the process. If more than 10% of the emitted CO₂ could be recaptured, this would compensate for the emissions generated in the production stage. In theory, biofuel-powered vehicles could then reduce atmospheric CO₂ levels as they drive, effectively becoming carbon negative.”
2025 Mazda Vision X Concept CoupeIn other words, if a car could both run on such biofuel and capture the carbon dioxide it produces, it could, in theory, absorb more carbon than it emits. The more it drives, the greater its contribution to reducing CO₂ in the atmosphere.
A long road ahead
This approach would obviously require a complex technological infrastructure, but it demonstrates Mazda’s creativity in exploring alternative solutions. Even if large-scale biofuel production became viable, challenges would remain—particularly in physically integrating CO₂ capture systems into vehicles, as weight, cost, and available space would be significant obstacles.
Mazda has made no concrete commitment to developing this technology yet. However, the company’s President and CEO, Masahiro Moro, reaffirmed Mazda’s commitment to sustainability during the Tokyo Motor Show:
“The phrase ‘The joy of driving fuels a sustainable tomorrow’ expresses not only Mazda’s fundamental spirit but also the foundation of our future challenges. Under the shared global mission of achieving carbon neutrality, Mazda believes that the joy of driving can be a positive force for both society and the planet. We remain committed to fulfilling the desire of those who love automobiles and wish to continue driving for as long as possible.”
Ambitious as it may be, this concept illustrates Mazda’s ongoing effort to reconcile driving pleasure with environmental responsibility, a pursuit that, for now, remains more of a research vision than an industrial reality.
