Oregon State MOF strips CO2 from humid flue gas without pre-drying

Industrial sources generate roughly 30 percent of US greenhouse gas emissions, according to the Environmental Protection Agency. Chemists at Oregon State University have filed a patent on a metal-organic framework (MOF) they say can strip carbon dioxide from those streams without first drying the gas.

The material, nicknamed BVR-X, appears in Angewandte Chemie. Saudi Aramco holds the patent filing on synthesis and CO2-capture properties. Several team members appear as co-inventors. Bench tests ran on a flue gas mix containing 4 percent CO2 — the concentration typical of natural gas combustion — with humidity dialled to levels that shut down rival sorbents.

What's different about BVR-X?

More than 100,000 distinct MOFs sit in catalogues today, built from positively charged metal ions wrapped in organic linker molecules. Their nanosized pores behave like molecular sponges, adsorbing CO2 onto interior surfaces. The same porosity that delivers high capacity also opens a weakness: water vapour displaces CO2 from the adsorption sites, and the capture process collapses.

BVR-X instead routes water and CO2 to separate regions inside its pores — what the team calls pore compartmentalization — so moisture no longer blocks the active chemistry. The internal organization lets the material work under conditions resembling real industrial emissions rather than dry benchtop feeds.

"Separating a small amount of carbon dioxide in the presence of substantial water is particularly challenging," Kyriakos Stylianou, director of Oregon State's Materials Discovery Laboratory (MaD Lab), said. "Which makes the result especially relevant for gas-fired power plants and similar facilities."

What did the lab tests show?

• High capture efficiency under heavily humidified gas streams.
• Regeneration through dozens of capture-and-release cycles with sustained performance.
• Stable behaviour under the temperature swings and chemical variability of real flue gas.

Who built it and who paid?

Team:

• Kyriakos Stylianou, director of Oregon State's MaD Lab
• Ankit Yadav, Emmanuel Musa, Andrzej Gładysiak (MaD Lab)
• Micah Hickethier, Chun-Wai Chang, Kai Shen Choong (OSU College of Engineering)
• Collaborators from UC Berkeley, University of Oregon and ARAMCO Research and Development Center

Funders:

• Saudi Aramco
• Murdock Charitable Trust
• Brian and Marilyn Kleiner donor-advised fund at the OSU Foundation

Why does humidity tolerance change the math?

Dehumidifying enormous volumes of industrial exhaust adds enough capital and operating cost to render CO2 removal nonviable at many plants. A sorbent that, in Stylianou's words, "responds to water by changing in a way that lets it keep capturing the greenhouse gas effectively," eliminates the drying stage from the balance sheet. Cycle life matters just as much: a sorbent that degrades after a handful of regenerations needs constant replacement, and the operating cost climbs back above the deployment threshold.

How does BVR-X fit the broader carbon-removal buildout?

Direct air capture (DAC) facilities draw the headlines. The world's largest opened in Iceland in 2024 and pulls CO2 from ambient air in quantities equivalent to the annual emissions of roughly 7,200 cars — a sliver of what heavy industry puts out hourly. Point-source capture at smokestacks, where CO2 sits at far higher concentration, offers the comparatively mature near-term route. Humid-tolerant sorbents such as BVR-X close the gap between clean-bench performance and the wet, dirty exhaust that real industrial sites deliver.

What milestone decides what happens next?

Watch the patent prosecution track at the US Patent and Trademark Office and any pilot announcement from Saudi Aramco's R&D arm. The decisive signal is BVR-X moving from the 4 percent CO2 lab cell into a slipstream at a working industrial plant — a gas-fired generator, refinery heater or similar facility — where humid exhaust currently passes untreated.