DAC’s dirty secret isn’t the fans or the contactors — it’s the regeneration step. Heating sorbents to 900°C (for solid sorbents) or boiling caustic solutions (for liquid systems) to release captured CO₂ consumes enormous amounts of energy. It’s the single biggest reason DAC costs $400–600/ton today. What if you could just… skip it?
A new paper in ACS Sustainable Chemistry & Engineering proposes exactly that. Researchers developed FeNi-modified CaZr dual-functional materials (DFMs) that capture CO₂ directly from ambient air and convert it into useful products via the reverse water-gas shift (RWGS) reaction — in the same reactor, on the same material, in a single integrated process.
How it works: The CaO/CaZrO₃ base acts as the sorbent, grabbing CO₂ from air the way any calcium-based DAC system would. But instead of heating the material to release pure CO₂ for storage, you flow hydrogen over it. The FeNi catalytic sites on the same material convert the captured CO₂ into CO and water right there. One material doing two jobs simultaneously. No separate regeneration furnace. No CO₂ compression and transport.
The reverse water-gas shift produces CO, which is a building block for synthetic fuels, chemicals, and other products via Fischer-Tropsch synthesis. So you go from atmospheric CO₂ to chemical feedstock in a single reactor step.
The catch (because there’s always a catch): this is early-stage lab work. The CO₂ concentrations tested, the cycling stability over thousands of runs, the hydrogen source economics — all of these need to scale before anyone should get excited about deployment timelines. And the hydrogen has to be green, or you’re just shuffling emissions around.
But the concept is genuinely clever. Traditional DAC systems spend 70-80% of their energy on the temperature swing or pressure swing needed to regenerate sorbents. If you can chemically convert the CO₂ in situ at lower temperatures, using the catalytic energy of the RWGS reaction instead of brute-force heating, the energy math changes fundamentally.
This fits a broader trend in DAC research: moving away from “capture, then figure out what to do with pure CO₂” toward integrated capture-and-conversion pathways. The Climeworks and Heirloom model — capture, release, compress, inject — works and is scaling now. But the next generation of DAC might look completely different: reactive sorbents that never release free CO₂ at all.
We’re still years away from knowing if DFMs can compete with established approaches at scale. The materials need to survive tens of thousands of cycles without degrading. The economics depend heavily on green hydrogen costs. And lab-scale performance famously doesn’t predict field-scale reality.
Still — eliminating DAC’s most energy-intensive step by redesigning the chemistry from scratch? That’s the kind of fundamental rethinking this field needs.