A scientist once called the air around us a "resource." In October 2025, Susumu Kitagawa of Kyoto University, age 74, walked away with a Nobel Prize in Chemistry and an audacious vision: to extract CO2, water, and hydrogen from the thin atmosphere we breathe. The material that makes it possible is called MOF. Switzerland's Climeworks spends roughly $1,000 per ton on direct air capture today, and a Japanese basic-science breakthrough is now reshaping that landscape.

A 30-Year Journey, Now Recognized

On October 8, 2025, the Royal Swedish Academy of Sciences awarded the Nobel Prize in Chemistry to three researchers: Susumu Kitagawa, Distinguished Professor at Kyoto University's Institute for Advanced Study; Richard Robson (88), Emeritus Professor at the University of Melbourne in Australia; and Omar M. Yaghi (60), Professor at the University of California, Berkeley.

The citation was straightforward: "for the development of metal-organic frameworks (MOFs)." Kitagawa became the ninth Japanese chemistry laureate, the first since lithium-ion battery pioneer Akira Yoshino in 2019, and the 27th Japanese Nobel laureate in the natural sciences overall.

Researchers often joke that "a Nobel Prize takes thirty years." Kitagawa's first three-dimensional porous coordination polymer using copper, nickel or zinc ions and a molecule called 4,4'-bipyridine was reported in 1997. Twenty-eight years later, the long road has reached its destination.

What Is a MOF? Designing Space Itself

MOFs are unusual materials. Imagine a Lego construction in which metal ions are the joints (nodes) and organic molecules are the struts (linkers). Together, they assemble into a crystal that looks like an ordinary powder, but inside, it is riddled with nanoscale pores. The internal surface area is staggering: a single sugar cube of MOF, unfolded, would cover a soccer field.

The trick is that the size and shape of those pores can be designed to specification.

"For a long time, chemists designed molecules. We design the space that molecules create," Kitagawa has said. The notion of treating empty space itself as the functional element was a paradigm shift.

By picking the right combination of metal and organic linker, researchers can make pores that grab only CO2, only water vapor, or only hydrogen. The Nobel committee called it "a new form of molecular architecture", and that astonishing design freedom is exactly what they meant.

Kitagawa's Insight: Crystals That Breathe

Each of the three laureates contributed something distinct. Robson built the first network compounds in 1989, but his structures were fragile and easily collapsed. In the late 1990s, Kitagawa and Yaghi independently figured out how to make MOFs that actually worked.

Kitagawa's defining contribution was showing that gases can flow in and out of these crystals, and that MOFs can be flexible, soft frameworks that change shape on cue. His 1997 paper demonstrated that his three-dimensional MOF could adsorb and release methane, oxygen, and nitrogen, introducing the world to "breathing crystals."

Yaghi, meanwhile, built more stable MOFs and pioneered "reticular chemistry", a rational design philosophy. The water-from-desert-air devices Yaghi has demonstrated, which pull drinkable moisture out of dry air, are direct descendants of this approach.

"Air as Resource": Basic Science Reaches Industry

Two weeks after the prize announcement, on October 22, Kitagawa spoke at a Chemical Society of Japan event in Tokyo. His comment captured the moment: many startups around the world are now ramping up MOF production, and what once meant only ten milligrams in a research lab has become tons-per-year industrial output.

The Kyoto University spinoff Atomis, where Kitagawa serves as scientific advisor, is one of roughly 51 MOF-related startups now active globally, according to remarks Kitagawa made at the same event.

The vision Kitagawa has championed for years is "air as a resource." Air belongs to no one and exists everywhere on Earth, yet humanity has lacked the tools to selectively extract its useful molecules. MOFs change that calculus.

Capture CO2, and you have climate action. Collect water vapor, and you have drinking water. Store hydrogen, and you have an energy carrier. Trap toxic gases safely, and you make chemical industries safer. The fundamental difficulty of "sorting gases" yields, finally, to engineered design.

The DAC Showdown: Can MOFs Beat Climeworks?

The frontline of climate technology right now is Direct Air Capture (DAC), pulling CO2 out of the open atmosphere, not just from smokestacks.

In May 2024, Switzerland's Climeworks brought its "Mammoth" plant online in Iceland. With a nameplate capacity of 36,000 tons of CO2 per year at full operation, it is one of the largest DAC facilities in the world. Captured CO2 is injected by partner Carbfix into deep basalt rock, where it mineralizes permanently.

But the economics remain brutal. Climeworks itself has acknowledged that its current cost is far closer to $1,000 (roughly ¥160,000) per ton than the $100 mark generally seen as the affordability threshold. The company has set targets of $400-600 per ton by 2030 and $200-350 per ton by 2040. Independent analyses also reported that Mammoth's actual 2024 CO2 capture fell well short of its design capacity, and Climeworks announced layoffs of at least 10% of its roughly 500 employees in mid-2025.

Climeworks uses amine-based sorbents that release CO2 at around 80-100°C. MOFs, by contrast, can in principle adsorb and desorb CO2 at lower temperatures and with less energy. That is the opening Japanese players are aiming for.

Japan's MOF × DAC Lineup: Atomis, SyncMOF, Kobe Steel

Several Japanese players are now applying MOFs to CO2 capture.

Atomis, the Kyoto University spinoff founded to commercialize Kitagawa's research, signed a capital and business partnership with trading house Nagase & Co. in 2021, then received investment from air-conditioning giant Daikin in 2023, building out a pipeline for early MOF deployment via Nagase's industrial network.

SyncMOF, a spinoff from Nagoya University, has already developed a household-refrigerator-sized DAC unit. Together with jam maker Aohata, it is running a trial that feeds captured CO2 to strawberries to boost yields. SyncMOF Vice President Akihiro Hori describes MOFs as "like the hemoglobin in red blood cells", a comparison that nicely captures their selective gas-binding nature.

The latest move comes from a three-way alliance of Kobe Steel, Atomis, and Nagase. Their MOF-loaded CO2 capture unit has reached 30 kg of CO2 separated per day, and the partners have announced plans to scale to a ton-per-day demonstration in fiscal 2026. Having a major steelmaker adopt MOFs on the emissions side could prove to be a turning point for Japan's CCUS industry.

The Hurdles: Cost and Mass Production

The MOF dream is enormous, but so are the obstacles.

First, manufacturing cost. Moving from grams in a lab to tons in a continuous process demands fundamental innovation in synthesis. Japanese players including Atomis are establishing relatively low-cost, low-impact synthesis routes, but the global mass-production race is just beginning.

Second, durability. Will the crystal structure hold up after thousands of CO2 adsorption-desorption cycles? Resistance to humidity and acidic gases will determine which MOFs survive in the field.

Third, energy balance. There is no point capturing CO2 if running the equipment emits more than it captures. The MOF advantage of low-temperature operation only pays off when paired with renewable electricity or industrial waste heat.

Even so, Kitagawa remains optimistic. The day after his Nobel announcement, he reflected that many people in the 1990s were unconvinced MOFs would ever be useful, but he kept going. From basic research to industry, it took thirty years. Over the next thirty, the air around us may finally be mined for what it carries.

In Japan, a "design-the-space" chemistry that started in a small Kyoto lab is now shaking the foundations of the global decarbonization business. How is direct air capture progressing in your country? Are companies investing in firms like Climeworks, or is your government supporting the technology? Let us know in the comments.

References